VMC VIQ Scholarship Test
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A line with two endpoints is referred to as a line segment, and a portion of a line with one endpoint is referred to as a ray.
Collinear points are those that have three or more points on the same line; otherwise, they are non-collinear points. When two rays originate from the same endpoint, an angle is formed.
The rays that form an angle are referred to as the angle's arms, and the endpoint is referred to as the vertex of the angle.
NCERT Solutions Class 9 Maths exercise 6.1 – In NCERT solutions for Class 9 Maths chapter 6 exercise 6.1 we get to know that an acute angle has a range of 0° to 90°, whereas a right angle has a value of 90°. An obtuse angle is one that is greater than 90° but less than 180°.
Also, keep in mind that a straight angle equals 180°. A reflex angle is an angle that is greater than 180° but less than 360°. Furthermore, two angles with a sum of 90° are referred to as complementary angles, while two angles with a sum of 180° are referred to as supplementary angles.
Along with Class 9 Maths, chapter 8 exercise 6.1 the following exercises are also present.
Answer:
Given that,
AB is a straight line. Lines AB and CD intersect at O. and BOD =
Since AB is a straight line
AOC + COE + EOB =
[since ]
So, reflex COE =
It is given that AB and CD intersect at O
Therefore, AOC = BOD [vertically opposite angle]
[ GIven BOD = ]
Also,
So, BOE =
Q2 In Fig. 6.14, lines XY and MN intersect at O. If and a : b = 2 : 3, find c.
Answer:
Given that,
Line XY and MN intersect at O and POY = also ..............(i)
Since XY is a straight line
Therefore, ...........(ii)
Thus, from eq (i) and eq (ii), we get
So,
Since MOY = c [vertically opposite angles]
a + POY = c
Q3 In Fig. 6.15, PQR = PRQ, then prove that PQS = PRT.
Answer:
Given that,
ABC is a triangle such that PQR = PRQ and ST is a straight line.
Now, PQR + PQS = {Linear pair}............(i)
Similarly, PRQ + PRT = ..................(ii)
equating the eq (i) and eq (ii), we get
{but PQR = PRQ }
Therefore, PQS = PRT
Hence proved.
Q4 In Fig. 6.16, if x + y = w + z , then prove that AOB is a line.
Answer:
Given that,
..............(i)
It is known that, the sum of all the angles at a point =
..............(ii)
From eq (i) and eq (ii), we get
Hence proved AOB is a line.
Answer:
Given that,
POQ is a line, OR PQ and ROQ is a right angle.
Now, POS + ROS + ROQ = [since POQ is a straight line]
.............(i)
and, ROS + ROQ = QOS
..............(ii)
Add the eq (i ) and eq (ii), we get
hence proved.
Answer:
Given that,
XYZ = and XY produced to point P and Ray YQ bisects ZYP
Now, XYP is a straight line
So, XYZ + ZYQ + QYP =
Thus reflex of QYP =
Since XYQ = XYZ + ZYQ [
=
In NCERT solutions for Class 9 Maths exercise 6.1, we get to know that if two angles share a common vertex, a common arm, and their non-common arms are on opposite sides of the common arm, they are adjacent.
A linear pair is formed when two adjacent angles are supplementary, i.e. they form a straight line (add up to 180).
When two lines intersect at a point, they form equal angles that are vertically opposite.
The sum of two adjacent angles formed by a ray on a line is 180°.
When the sum of two adjacent angles equals 180°, the angles' non-common arms form a line.
Also Read| Lines And Angles Class 9 Notes
Exercise 6.1 Class 9 Maths, is based on the concepts of lines and angles
From Class 9 Maths chapter 6 exercise 6.1 we learn about parallel lines and pairs of angles
Understanding the concepts from Class 9 Maths chapter 6 exercise 6.1 will allow us to understand the concepts related to angle sum properties of LINES AND ANGLES.
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Also see
This exercise is about lines and angles, types of angles like vertically opposite angles and axioms and concepts like parallel lines and pair of angles.
An angle is a figure which is formed by two rays, called the sides of the angle, both of which shares a common endpoint, called the vertex of the angle.
If we have three or more points that lie on the same line then they are called collinear points.
There are various types of angles are:
Acute angle
Right angle
Obtuse angle
Straight angle
Reflex angle
A reflex angle is an angle greater than 180° and less than 360°.
When we have two or more lines meeting or crossing each other in a plane, they are termed as intersecting lines.
When we have two lines sharing a common endpoint, called Vertex then an angle that is formed between these two lines is known as the pair of angles.
When we have two lines intersecting each other, the opposite angles are equal. These angles are known as the vertically opposite angles because they are equal and opposite to each other at the vertex.
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