Question

prove exterior angle property of triangle

Answer 1

exterior angle =sum of other two interior angles of a triangle

Answer 2

Answer:

Step-by-step explanation:let the exterior angle be angle 4

Let the interior angles be angle 1, angle 2 ,angle 3

= 1 + 2 + 3 = 180(angle sum prop.)

= 3 + 4 = 180(linear pair)

= 1 + 2 + 3 = 3 + 4

= 1 + 2 + 3 - 3 = 4

= 1 + 2 = 4(proved)