Question

What is the measure of angle A in the triangle?

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m < A = ? °

Answer 1

The interior angles of a triangle add up to 180 degrees.

(2x - 10) + (x + 30) + 70 = 180...combine like terms
3x + 90 = 180
3x = 180 - 90
3x = 90
x = 90/3
x = 30

m < A = 2x - 10 = 2(30) - 10 = 60 - 10 = 50 <== m < A

So A=50 Degrees