Parallelogram ABCD has angle B = 75°.
A student lists the four angles in order A, B, C, D.
What is the sum angle A + angle C (in degrees)?

Question

Parallelogram ABCD has angle B = 75°. A student lists the four angles in order A, B, C, D. What is the sum angle A + angle C (in degrees)?

Accepted Answer

210. Angle A is adjacent to B: A = 180 - 75 = 105. Angle C = angle A = 105 (opposite angles). A + C = 105 + 105 = 210°.

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