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8 September, 12:22

If angle A is complementary to angle B, and angle B is supplementary to angle C, what is the measurement of angle C if angle A is 21 degree ...

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  1. 8 September, 16:18
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    C = 111 degrees

    Since A and B are complementary they add to 90. So we know that B must be 69 degrees.

    Since B and C are supplementary they add to 180. So we know that C must be 111.
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