In triangle ABC, the angle is 78, the angle B is 12 degrees greater. Find the value of the angle C.
| July 11, 2021 | education
In triangle ABC, the angle is 78, the angle B is 12 degrees greater. Find the value of the angle C. Determine the shape of the triangle ABC.
Since angle B is 12 ° larger, angle A is:
78 + 12 = 90 °.
Since the sum of the angles of a triangle is 180 °, then:
C = 180 ° – 90 ° – 12 = 78 °.
Since the angle A is 90 °, the triangle is right-angled.
Answer: the required angle is 90 °, the triangle is rectangular.
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