NEET/JEE Coaching Scholarship
Get up to 90% Scholarship on Offline NEET/JEE coaching from top Institutes
We see some clothes hangers, sandwiches, traffic signboards, etc. Do you know which shape they represent? All these things are triangular. Let’s try to find out what a triangle is. Triangles are fundamental geometric 2-D shapes characterized by three sides, three angles, and a sum of 180 degrees for their interior angles. It is the polygon with the least number of sides. The sum of the lengths of the two sides of a triangle is greater than the length of the third side. In the same way, the difference between the two sides of a triangle is less than the length of the third side.
This article on NCERT Solutions for Class 10 Maths Chapter 6 Triangles provides clear and step-by-step solutions for exercise problems in the NCERT Class 10 Maths Book. These solutions for class 10 maths chapter 6 Triangles are designed by Subject Matter Experts according to the latest CBSE syllabus, ensuring that students grasp the concepts effectively.
Based on the sides, we have 3 triangles:
Based on the measurement of the angle, we have 3 triangles:
Two triangles are similar if they have the same ratio of corresponding sides and an equal pair of corresponding angles.
Criteria for Triangle Similarity:
Theorem 6.1: If a line is drawn parallel to one side of a triangle and it cuts the other two sides at different points, it divides those two sides in the same ratio.
Theorem 6.2: If a line divides two sides of a triangle in the same ratio, then the line is parallel to the third side of the triangle.
Theorem 6.3: If two triangles have their corresponding angles equal, then their corresponding sides are in the same ratio, which means the two triangles are similar.
Theorem 6.4: If the sides of one triangle are in the same ratio as the sides of another triangle, then their corresponding angles are also equal, making the two triangles similar.
Theorem 6.5: If one angle of a triangle is equal to one angle of another triangle and the sides around these angles are in the same ratio, then the two triangles are similar.
Maths Chapter 6 Triangles class 10 Exercise: 6.1
Answer:
All circles are similar.
Since all the circles have a similar shape. They may have different radii, but the shape of all circles is the same.
Therefore, all circles are similar.
Answer:
All squares are similar.
Since all the squares have a similar shape. They may have a different side, but the shape of all squares is the same.
Therefore, all squares are similar.
Answer:
All equilateral triangles are similar.
Since all the equilateral triangles have a similar shape. They may have different sides, but the shape of all equilateral triangles is the same.
Therefore, all equilateral triangles are similar.
Answer:
Two polygons of the same number of sides are similar if their corresponding angles are equal and their corresponding sides are proportional.
Thus, (a) equal
(b) proportional
Q2 (1) Give two different examples of a pair of similar figures.
Answer:
The two different examples of a pair of similar figures are :
1. Two circles with different radii.
2. Two rectangles with different breadth and length.
Q2 (2) Give two different examples of a pair of non-similar figures.
Answer:
The two different examples of a pair of non-similar figures are :
1. Rectangle and circle
2. A circle and a triangle.
Q3 State whether the following quadrilaterals are similar or not:
Answer:
Quadrilateral PQRS and ABCD are not similar as their corresponding sides are proportional, i.e.
Class 10 Maths Chapter 6 Triangles Exercise: 6.2
Q1 In Fig. 6.17, (i) and (ii), DE || BC. Find EC in (i) and AD in (ii).
Answer:
(i)
Let EC be x
Given: DE || BC
By using the proportionality theorem, we get
(ii)
Let AD be x
Given: DE || BC
By using the proportionality theorem, we get
Answer:
(i)
Given :
PE = 3.9 cm, EQ = 3 cm, PF = 3.6 cm and FR = 2.4 cm
We have
Hence, EF is not parallel to QR.
Answer:
(ii)
Given :
PE = 4 cm, QE = 4.5 cm, PF = 8 cm and RF = 9 cm
We have
Hence, EF is parallel to QR.
Q2 (3) E and F are points on the sides PQ and PR, respectively, of a triangle PQR. For each of the following cases, state whether EF || QR : PQ = 1.28 cm, PR = 2.56 cm, PE = 0.18 cm and PF = 0.36 cm
Answer:
(iii)
Given :
PQ = 1.28 cm, PR = 2.56 cm, PE = 0.18 cm and PF = 0.36 cm
We have
Hence, EF is parallel to QR.
Q3 In Fig. 6.18, if LM || CB and LN || CD, prove that
Answer:
Given : LM || CB and LN || CD
To prove :
Since , LM || CB so we have
Also, LN || CD
From equations 1 and 2, we have
Hence proved.
Q4 In Fig. 6.19, DE || AC and DF || AE. Prove that BF / FE = BE / EC
Answer:
Given: DE || AC and DF || AE.
To prove :
Since , DE || AC so we have
Also, DF || AE
From equations 1 and 2, we have
Hence proved.
Q5 In Fig. 6.20, DE || OQ and DF || OR. Show that EF || QR.
Answer:
Given: DE || OQ and DF || OR.
To prove EF || QR.
Since DE || OQ so we have
Also, DF || OR
From equations 1 and 2, we have
Thus, EF || QR. (converse of basic proportionality theorem)
Hence proved.
Answer:
Given : AB || PQ and AC || PR
To prove: BC || QR
Since, AB || PQ so we have
Also, AC || PR
From equations 1 and 2, we have
Therefore, BC || QR. (converse basic proportionality theorem)
Hence proved.
Answer:
Let PQ be a line passing through the midpoint of line AB and parallel to line BC, intersecting line AC at point Q.
i.e.
Using the basic proportionality theorem, we have
Since
Answer:
Let P be the midpoint of line AB and Q be the midpoint of line AC.
PQ is the line joining midpoints P and Q of lines AB and AC, respectively.
i.e.
we have,
From equations 1 and 2, we get
Answer:
Draw a line EF passing through point O such that
To prove :
In
So, by using the basic proportionality theorem,
In
So, by using the basic proportionality theorem,
Using equations 1 and 2, we get
Hence proved.
Answer:
Draw a line EF passing through point O such that
Given :
In
So, by using the basic proportionality theorem,
However, it is given that
Using equations 1 and 2, we get
Therefore, ABCD is a trapezium.
Class 10 Maths Chapter 6 Triangles Exercise: 6.3
Answer:
(i)
So ,
(ii) As corresponding sides of both triangles are proportional.
(iii) Given triangles are not similar because corresponding sides are not proportional.
(iv)
(v) Given triangles are not similar because the corresponding angle is not contained by two corresponding sides
(vi) In
In
Answer:
Given :
In
Since,
Answer:
In
Hence proved.
Q4 In Fig. 6.36,
Answer:
Given :
To prove :
In
In
Q5 S and T are points on sides PR and QR of
Answer:
Given :
To prove RPQ ~
In
Q6 In Fig. 6.37, if
Answer:
Given:
To prove ADE ~
Since
In
and
Therefore,
Q7 (1) In Fig. 6.38, altitudes AD and CE of
Answer:
To prove :
In
Q7 (2) In Fig. 6.38, altitudes AD and CE of
Answer:
To prove :
In
Q7 (3) In Fig. 6.38, altitudes AD and CE of
Answer:
To prove :
In
Q7 (4) In Fig. 6.38, altitudes AD and CE of
Answer:
To prove :
In
Q8 E is a point on the side AD produced of a parallelogram ABCD, and BE intersects CD at F. Show that
Answer:
To prove :
In
Q9 (1) In Fig. 6.39, ABC and AMP are two right triangles, right-angled at B and M, respectively. Prove that:
Answer:
To prove :
In
Q9 In Fig. 6.39, ABC and AMP are two right triangles, right-angled at B and M, respectively. Prove that
Answer:
To prove :
In
Hence proved.
Q10 (1) CD and GH are respectively the bisectors of
Answer:
To prove :
Given :
In
Hence proved.
Q 10 (2) CD and GH are respectively the bisectors of
Answer:
To prove :
Given :
In
Q10 (3) CD and GH are respectively the bisectors of
Answer:
To prove :
Given :
In
Answer:
To prove :
Given: ABC is an isosceles triangle.
In
Answer:
AD and PM are medians of triangles. So,
Given :
In
In
Therefore,
Q13 D is a point on the side BC of a triangle ABC such that
Answer:
In,
Answer:
Produce AD and PM to E and L such that AD=DE and PM=DE. Now,
join B to E, C to E, Q to L and R to L.
AD and PM are medians of a triangle; therefore
QM=MR and BD=DC
AD = DE (By construction)
PM=ML (By construction)
So, diagonals of ABEC bisecting each other at D, so ABEC is a parallelogram.
Similarly, PQLR is also a parallelogram.
Therefore, AC=BE ,AB=EC and PR=QL,PQ=LR
Similarity,
Adding equations 1 and 2,
In
Answer:
CD = pole
AB = tower
Shadow of pole = DF
Shadow of tower = BE
In
Hence, the height of the tower is 42 cm.
Q16 If AD and PM are medians of triangles ABC and PQR, respectively, where
Answer:
AD and PM are medians of a triangle. So,
From equations 1 and 3, we have
In
Importance of solving 10th Class Maths Triangles NCERT Questions
Triangles Class 10 Solutions - Exercise Wise
Here are the exercise-wise links for NCERT class 10, Chapter 6 Polynomial:
For subject-wise solutions, Students can refer to the following links.
To refer to the syllabus and books, students can click on the following links.
Given below are the subject-wise exemplar solutions of class 10 NCERT:
NCERT Class 10 Maths Chapter 6, "Triangles," focuses on the similarity of triangles, including criteria for similarity (AA, SSS, SAS), and theorems like the Basic Proportionality Theorem and Pythagoras Theorem.
To prove the Pythagorean theorem (a2+b2=c2) using similar triangles, we can draw an altitude from the right angle to the hypotenuse, creating two smaller triangles that are similar to each other and the original triangle, then use the proportional sides of similar triangles to derive the theorem.
Thales's Theorem or Basic Proportionality Theorem (BPT) states that if a line is drawn parallel to one side of a triangle intersecting the other two sides in distinct points, then the other two sides are divided in the same ratio.
Similar triangles have various real-life applications, including measuring inaccessible heights or distances, understanding how zoom works on cameras, and in fields like cartography, engineering, and construction.
Congruent triangles are identical in both shape and size, while similar triangles have the same shape but can differ in size, with corresponding sides being proportional. These concepts are discussed in class 10 maths chapter 6 solutions, practice these to command the concepts.
Admit Card Date:03 February,2025 - 04 April,2025
Admit Card Date:07 March,2025 - 04 April,2025
Admit Card Date:10 March,2025 - 05 April,2025
Hello
Since you are a domicile of Karnataka and have studied under the Karnataka State Board for 11th and 12th , you are eligible for Karnataka State Quota for admission to various colleges in the state.
1. KCET (Karnataka Common Entrance Test): You must appear for the KCET exam, which is required for admission to undergraduate professional courses like engineering, medical, and other streams. Your exam score and rank will determine your eligibility for counseling.
2. Minority Income under 5 Lakh : If you are from a minority community and your family's income is below 5 lakh, you may be eligible for fee concessions or other benefits depending on the specific institution. Some colleges offer reservations or other advantages for students in this category.
3. Counseling and Seat Allocation:
After the KCET exam, you will need to participate in online counseling.
You need to select your preferred colleges and courses.
Seat allocation will be based on your rank , the availability of seats in your chosen colleges and your preferences.
4. Required Documents :
Domicile Certificate (proof that you are a resident of Karnataka).
Income Certificate (for minority category benefits).
Marksheets (11th and 12th from the Karnataka State Board).
KCET Admit Card and Scorecard.
This process will allow you to secure a seat based on your KCET performance and your category .
check link for more details
https://medicine.careers360.com/neet-college-predictor
Hope this helps you .
Hello Aspirant, Hope your doing great, your question was incomplete and regarding what exam your asking.
Yes, scoring above 80% in ICSE Class 10 exams typically meets the requirements to get into the Commerce stream in Class 11th under the CBSE board . Admission criteria can vary between schools, so it is advisable to check the specific requirements of the intended CBSE school. Generally, a good academic record with a score above 80% in ICSE 10th result is considered strong for such transitions.
hello Zaid,
Yes, you can apply for 12th grade as a private candidate .You will need to follow the registration process and fulfill the eligibility criteria set by CBSE for private candidates.If you haven't given the 11th grade exam ,you would be able to appear for the 12th exam directly without having passed 11th grade. you will need to give certain tests in the school you are getting addmission to prove your eligibilty.
best of luck!
According to cbse norms candidates who have completed class 10th, class 11th, have a gap year or have failed class 12th can appear for admission in 12th class.for admission in cbse board you need to clear your 11th class first and you must have studied from CBSE board or any other recognized and equivalent board/school.
You are not eligible for cbse board but you can still do 12th from nios which allow candidates to take admission in 12th class as a private student without completing 11th.
Get up to 90% Scholarship on Offline NEET/JEE coaching from top Institutes
This ebook serves as a valuable study guide for NEET 2025 exam.
This e-book offers NEET PYQ and serves as an indispensable NEET study material.
As per latest 2024 syllabus. Physics formulas, equations, & laws of class 11 & 12th chapters
As per latest 2024 syllabus. Chemistry formulas, equations, & laws of class 11 & 12th chapters
Accepted by more than 11,000 universities in over 150 countries worldwide