Question

state and prove the exterior angle theorem of a triangle​

Answer 1

Answer:

The exterior angle theorem states that if a triangle's side gets an extension, then the resultant exterior angle would be equal to the sum of the two opposite interior angles of the triangle. According to the Exterior Angle Theorem, the sum of measures of ∠ABC and ∠CAB would be equal to the exterior angle ∠ACD.

Answer 2

Answer:

The exterior angle theorem states that if a triangle’s side gets an extension, then the resultant exterior angle would be equal to the sum of the two opposite interior angles of the triangle.