Question

ABCDE is a regular pentagon.find the angle of triangle ADC?

Answer 1

Answer:

in any convex polygon. So, 360 deg./5 =72 deg., and 180 - 72 = 108). The interior angles of triangle ADC are: 36, 72, and 72 degrees. Since this regular polygon has 5 vertices (implied from the ABCDE), it's a regular pentagon.

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