CBSE Class 7 Mathematics Lines And Angles Worksheet Set 05

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Revision Notes on Lines and Angles

Point: A point is a geometrical element which has no dimensions

Line: A line is a straight path which has no endpoints.

 

3. Adjacent Angles: It is the pair of two angles which are placed next to each other. Adjacent angles have-

• A common vertex.

• A common arm.

• A non-common arm could be on either side of the common arm.

4. Linear Pair: A pair of adjacent angles whose non-common arm makes a single line i.e. they are the opposite rays.

A linear pair is also a pair of supplementary angles as their sum is 180°.

The above pair of angles is –

•  Adjacent, as they have one common arm.

•  Supplementary, as the sum of two angles, is 180°.

•  The linear pair, as the sum is 180° and the non – common arms are opposite rays.

5. Vertically Opposite Angles: When two lines intersect each other then they form four angles. So that

• ∠a and ∠b is pair of vertically opposite angles.

• ∠n and ∠m is pair of vertically opposite angles.

Vertically opposite angles are equal.

Pairs of Lines

1. Intersecting Lines If two lines touch each other in such a way that there is a point in common then these lines are called intersecting lines.

That common point is called a Point of Intersection.

Here, line l and m intersect each other at point C.

2. Transversal: If a line intersects two or more lines at different points then that line is called Transversal Line.

3. Angles made by a transversal: When a transversal intersects two lines then they make 8 angles.

Please refer to attached file for CBSE Clas 7 Maths Worksheet - Lines & Angles