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 60° 60 degrees 180° 180 degrees 90° 90 degrees 30°
m∠A + m∠B + m∠C = 180°
x + 2x + 90 = 180
3x + 90 = 180
3x = 90
x = 30
Therefore, m∠B = 2x = 2(30) = 60°
The measure of ∠B is 60 degrees.