A = B + 20
90 + A + B = 180
Substitute B+20 for A in the second equation and solve for B. Insert that value into the first equation to solve for A. Check by putting both values into the second equation.
In triangle ABC, the degree measure of angle A is 20 degree greater than the degree measure of angle B. Angle C is a right angle. What is the measure of angle B? Is it 70 degrees. 90-20=70
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