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20 September, 05:04

m∠A = 42 and m∠C = 57. Find m∠B.

A. 81

B. 99

C. 132

D. 147

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Answers (1)
  1. 20 September, 05:50
    0
    A.

    because the total distance of every triangle 180. Add the two other angles so 42 + 57 = 99. Then you have to subtract those two combined angles to find the missing one from the total distance, which is 180. 180-99=81. the answer is A. 81
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