Questions: Prove that the measures of the exterior angles of a triangle have a sum of 360°. Given: angle 1, angle 2, and angle 3 are exterior angles. Prove: m angle 1 + m angle 2 + m angle 3 = 360 It is given that angle 1, angle 2, and angle 3 are exterior angles.
Transcript text: Prove that the measures of the exterior angles of a triangle have a sum of $360^{\circ}$.
Given: $\angle 1, \angle 2$, and $\angle 3$ are exterior angles.
Prove: $m \angle 1+m \angle 2+m \angle 3=360$
It is given that $\angle 1, \angle 2$, and $\angle 3$ are exterior angles.
Solution
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