In a right-angled triangle ABC, angle A is straight. The outside angle at apex B is 120 degrees. Find the angle C.
| November 19, 2020 | education
Given: triangle ABC – rectangular
Angle A = 90 degrees
Outside angle at vertex B is 120 degrees
Find: angle C?
Decision:
180-120 = 60 degrees angle B (since the sum of the outer angle and another angle is 180 degrees)
180-90-60 = 30 degrees angle C
Answer: angle C = 30 degrees
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