## CBSE Class 7 Maths Chapter 5 Lines and Angles Revision Notes

If you are looking forward to scoring excellent marks in your Class 7 Maths Exams then it becomes very significant to understand the importance of Revision. Revision is very important as it helps you remember all the important chapters and co-related concepts that you have learned earlier and for the purpose of Revision, Revision Notes are always considered the best as they make your learning easy and convenient.

Chapter 5 of CBSE Class 7 Maths is Lines and Angles. Swiflearn offers the best and most reliable CBSE Class 7 Maths Chapter 5 Lines and Angles Revision Notes that will make students understand all the important topics & concepts of this chapter and will help them in higher studies also. Free CBSE Class 7 Maths Chapter 5 Lines and Angles Revision Notes provided here are prepared under the auspices of our Excellent Teachers keeping in mind the latest CBSE guidelines.

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**Lines and angles**

**Point**

Point is an element of geometry that has no dimension.

**Line**

A line is a straight path with no endpoints.

Line has one dimension.

**Line segment **

A straight path restricted between two endpoints.

**Ray**

A ray is endless from one side and restricted from the other side with an endpoint.

**Intersecting line**

If two distinct lines meet or cross at a point they are called intersecting lines.

**Parallel lines**

Parallel lines are the lines that are at same distance apart from each other and never intersect anywhere in a plane.

**Traversal line**

If a line intersects two or more lines at different points it is called traversal line

**Angle**

It is made up of two rays which are starting from a common point.

**Acute Angle **

The measure of an acute angle is smaller than 90o.

**Obtuse Angle **

An Obtuse angle is more than 90 degrees but is less than 180 degrees.

**Right Angle **

An angle of 90 degrees is called a right angle.

**Straight Angle **

An angle of 180 degrees forms a straight angle. Such an angle is formed by a straight line.

**Reflex Angle**

An angle that measures more than 180 degrees but less than 270 degrees is called a reflex angle.

**Full Angle**

A full angle is an angle that is 360 degrees.

**Complementary Angle**

If the sum of two angles is 90° then they are called complementary angles.

Example: 30o, 60o

**Supplementary Angle**

If the sum of two angles is 180° then they are called complementary angles.

Example: 100°, 20°

**Adjacent Angle**

When two placed next to each other they are called Adjacent angles.

It has a common vertex and a common arm.

### CBSE Class 7 Maths Chapter 5 Lines and Angles Revision Notes PDF