Answer:
B
Explanation:
54°
Sum of angles in a triangle = 180°
Value of angles known = 5x+90*
Equation = 180 - 90 = 5x
90 = 5x
x = 90/5
x = 18
m∠2 = 3x
m∠2 = 3 x 18
m∠2 = 30 + 24
m∠2 = 54°
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