x + x + 90 + x − 18 = 180 3 x = 108 x = 36 m ∠ Q = 36 + 90 = 126
The missing angle C in the triangle can be calculated by using the fact that the sum of the angles in a triangle is 180 degrees. By subtracting the sum of the two known angles (30.1° and 48.7°) from 180°, we find that C equals 101.2°. Therefore, C = 101.2°.
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