Math Doubts

Exterior angles formed by Parallel lines and their Transversal

exterior angles of transversal of parallel lines

Angles are formed externally when two or more parallel lines are intersected by their transversal and the outside angles are called exterior angles of parallel lines and their transversal.

Observe the picture which expresses an intersection of two parallel lines and their transversal. The intersection of them formed four angles externally. Therefore, they are known as exterior angles of the parallel lines and their transversal.

Exterior angles

formation of exterior angles of parallel lines and their transversal

Four exterior angles are formed geometrically when two parallel lines are cut by their transversal.

$1. \,\,\,\,\,\,$ $\angle APX$ is first exterior angle

$2. \,\,\,\,\,\,$ $\angle XPB$ is second exterior angle

$3. \,\,\,\,\,\,$ $\angle DQY$ is third exterior angle

$4. \,\,\,\,\,\,$ $\angle YQC$ is fourth exterior angle

The four angles are formed externally when two parallel lines are cut by a straight line. So, they are called as exterior angles.

Property

equality property of exterior angles of parallel lines and their transversal

The exterior angles which appear in opposite side alternatively are equal geometrically when a pair of parallel lines cut by a transversal.

$1. \,\,\,\,\,\,$ $\angle APX = \angle DQY$

$2. \,\,\,\,\,\,$ $\angle XPB = \angle YQC$

The property of exterior angles is often useful to us while studying the geometrical mathematics and its related subjects.

Math Doubts

A best free mathematics education website for students, teachers and researchers.

Maths Topics

Learn each topic of the mathematics easily with understandable proofs and visual animation graphics.

Maths Problems

Learn how to solve the maths problems in different methods with understandable steps.

Learn solutions

Subscribe us

You can get the latest updates from us by following to our official page of Math Doubts in one of your favourite social media sites.

Copyright © 2012 - 2022 Math Doubts, All Rights Reserved