Question

prove the sum of three exterior angles formed at three vertices of a triangle is equal to the fourth right angle

Answer 1

Answer:

Properties. An exterior angle of a triangle is equal to the sum of the opposite interior angles. For more on this see Triangle external angle theorem. If the equivalent angle is taken at each vertex, the exterior angles always add to 360° In fact, this is true for any convex polygon, not just triangles.

Step-by-step explanation:

Answer 2

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