Question

in a triangle ABC angleA-angleB, angleB-angleC then the measure of angleB is
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Answer 1

Answer:

A triangle ABC angle A ,Angle B and Angle B,Angle C is the measure of Angle B is 30 degree

Step-by-step explanation:

Angle A, Angle B =120 °degree

Angle B, Angle C = 90°degree

Then we subtract 120-90

120

-. 90

_______

30

so, answer is 30°