To find the average of the angles a, b, c, d, and e, add them together and divide by the number of angles. Since a, b, and c are angles in a triangle, they sum to 180°. Angles d and e are supplementary, so they sum to 180° as well. Therefore, the total sum is 180° + 180° = 360°. The average is 360° / 5 = 72°.
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