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1. |
If the ratio of four angles of a quadrilateral is ∠A : ∠B : ∠C : ∠D = 1 : 2 : 3 : 4, what is the value of ∠C? |
A. | 90° |
B. | 108° |
C. | 180° |
D. | 72° |
Answer» C. | |