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7 January, 20:34

A and B are vertical angles. If A = 4x - 10 and B = 6x - 30, find mA.

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  1. 7 January, 21:30
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    If A and B are vertical angles, then A = B. Thus, 4x - 10 = 6x - 30, and 10 = x. Check: Does 4 (10) - 10 = 6 (10) - 30? Does 30 = 30? YES. So x = 10 is correct. The measure of angle A is 30 degrees.
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