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

180°

180 degrees

30°

30 degrees

60°

60 degrees

90°

90 degrees
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Answer 1

m∠A + m∠B + m∠C = 180° (straight line).
x + 2x + 90 = 180 → 3x = 90 → x = 30°.
m∠B = 2x = 60°.