In the ABC triangle, the angle A is 13 degrees, the outer angle at the vertex B is 112 degrees.
| May 14, 2021 | education
In the ABC triangle, the angle A is 13 degrees, the outer angle at the vertex B is 112 degrees. Find the degree measure of the angle C.
<A = 13 °; (180 ° – <B) = 112 °; <C = 180 ° – <A – <B, so <A; <B; <С belong to triangle ABC,
<B = 180 ° – 112 = 68 °; <C = 180 ° – 13 ° – 68 ° = 99 °.
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