What is the measure of angle A in the triangle? Enter your answer in the box.

1 answer:

4 0

Angles in a triangle add up to 180 degrees.
(2x-10)+(x+30)+70=180
(2x-10)+(x+30)=110
3x+20=110
3x=90
x=30
so A:
2(30)-10
=50

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