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NCERT Solutions for Exercise 4.3 Class 12 Maths Chapter 4 Determinants are discussed here. These NCERT solutions are created by subject matter expert at Careers360 considering the latest syllabus and pattern of CBSE 2023-24. NCERT solutions for Class 12 Maths chapter 4 exercise 4.3 consists of questions related to finding the area of a triangle using determinants. In earlier classes, you have learned about finding areas of the triangle of given vertices. Now you can find that using determinants also. All the questions in exercise 4.3 Class 12 Maths are related to finding the area of the triangle using determinants only.
Since the area is a positive quantity, you should always take the absolute value of the determinant. Class 12th Maths chapter 4 exercise 4.3 exercise is very simple as well as important for board exams. As it includes a lot of calculations, the chances of silly mistakes are more here. 12th class Maths exercise 4.3 answers are designed as per the students demand covering comprehensive, step by step solutions of every problem. Practice these questions and answers to command the concepts, boost confidence and in depth understanding of concepts. Students can find all exercise together using the link provided below.
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Question:1(i) Find area of the triangle with vertices at the point given in each of the following :
Answer:
We can find the area of the triangle with vertices by the following determinant relation:
Expanding using second column
Question:1(ii) Find area of the triangle with vertices at the point given in each of the following :
Answer:
We can find the area of the triangle with given coordinates by the following method:
Question:1(iii) Find area of the triangle with vertices at the point given in each of the following :
Answer:
Area of the triangle by the determinant method:
Hence the area is equal to
Question:2 Show that points are collinear.
Answer:
If the area formed by the points is equal to zero then we can say that the points are collinear.
So, we have an area of a triangle given by,
calculating the area:
Hence the area of the triangle formed by the points is equal to zero.
Therefore given points are collinear.
Question:3(i) Find values of k if area of triangle is 4 sq. units and vertices are
Answer:
We can easily calculate the area by the formula :
or
or or
Hence two values are possible for k.
Question:3(ii) Find values of k if area of triangle is 4 sq. units and vertices are
Answer:
The area of the triangle is given by the formula:
Now, calculating the area:
or
Therefore we have two possible values of 'k' i.e., or .
Question:4(i) Find equation of line joining and using determinants.
Answer:
As we know the line joining , and let say a point on line will be collinear.
Therefore area formed by them will be equal to zero.
So, we have:
or
Hence, we have the equation of line .
Question:4(ii) Find equation of line joining and using determinants.
Answer:
We can find the equation of the line by considering any arbitrary point on line.
So, we have three points which are collinear and therefore area surrounded by them will be equal to zero.
Calculating the determinant:
Hence we have the line equation:
or .
Question:5 If the area of triangle is 35 sq units with vertices and . Then k is
(A) (B) (C) (D)
Answer:
Area of triangle is given by:
or
or
Hence the possible values of k are 12 and -2.
Therefore option (D) is correct.
In exercise 4.3 Class 12 Maths, there are 4 long answer types questions and one multiple-choice type question related to finding the area of the triangle. There are two solved examples given before Class 12 Maths ch 4 ex 4.3 that you can solve to get conceptual clarity. You should solve given exercise problems on your own. If you are facing difficulties while solving them, you can take help from NCERT Solutions for Class 12 Maths Chapter 4 Exercise 4.3.
Also Read| Determinants Class 12 Chapter 4 Notes
Also see-
Subject Wise NCERT Exampler Solutions
Happy learning!!!
Yes, we can find the area of the triangle using determinants if the vertices of the triangle are given.
Yes, here you will get NCERT Solutions for free. NCERT solutions for Class 12 Maths, Physics, Chemistry and Biology are available chapter wise.
Yes, You can download the NCERT book from their official website.
Here you will get NCERT Solutions for Class 6 to 10. The solutions for Science and Mathematics are given chapter wise. Students can follow NCERT syllabus for a better score to get good marks in CBSE annual exams.
Triangle formed by three collinear points is a straight line, hence the area of such a triangle is zero.
NCERT solutions are useful for the students to get conceptual clarity.
NCERT solutions are helpful for competitive exams like JEE Main, NEET, VITEEE, etc.
There are 13 chapters starting from relations and functions to probability. Chapters from algebra, calculus are present.
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Hello there! Thanks for reaching out to us at Careers360.
Ah, you're looking for CBSE quarterly question papers for mathematics, right? Those can be super helpful for exam prep.
Unfortunately, CBSE doesn't officially release quarterly papers - they mainly put out sample papers and previous years' board exam papers. But don't worry, there are still some good options to help you practice!
Have you checked out the CBSE sample papers on their official website? Those are usually pretty close to the actual exam format. You could also look into previous years' board exam papers - they're great for getting a feel for the types of questions that might come up.
If you're after more practice material, some textbook publishers release their own mock papers which can be useful too.
Let me know if you need any other tips for your math prep. Good luck with your studies!
It's understandable to feel disheartened after facing a compartment exam, especially when you've invested significant effort. However, it's important to remember that setbacks are a part of life, and they can be opportunities for growth.
Possible steps:
Re-evaluate Your Study Strategies:
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Remember: This is a temporary setback. With the right approach and perseverance, you can overcome this challenge and achieve your goals.
I hope this information helps you.
Hi,
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hello mahima,
If you have uploaded screenshot of your 12th board result taken from CBSE official website,there won,t be a problem with that.If the screenshot that you have uploaded is clear and legible. It should display your name, roll number, marks obtained, and any other relevant details in a readable forma.ALSO, the screenshot clearly show it is from the official CBSE results portal.
hope this helps.
Hello Akash,
If you are looking for important questions of class 12th then I would like to suggest you to go with previous year questions of that particular board. You can go with last 5-10 years of PYQs so and after going through all the questions you will have a clear idea about the type and level of questions that are being asked and it will help you to boost your class 12th board preparation.
You can get the Previous Year Questions (PYQs) on the official website of the respective board.
I hope this answer helps you. If you have more queries then feel free to share your questions with us we will be happy to assist you.
Thank you and wishing you all the best for your bright future.
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