prove exterior angle property of triangle
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exterior angle =sum of other two interior angles of a triangle
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23
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)
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