Question

In a geometric diagram, ∠A and ∠B are complementary, and they form a straight line with ∠C . If m∠A=x° , m∠B=(2x)° , and m∠C=90° , what is the measure of ∠B ?(1 point)
Responses

90°
90 degrees

30°
30 degrees

60°
60 degrees

180°

Answer 1

The measure of angle B is 90° because angles A and B are complementary, and angle A is x°, so angle B must be 90° - x°. Since angle C is 90°, the sum of angles A, B, and C is 180°. Thus, angle B must be 90°.