Question

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

Answer 1

mZA=50

Explanation:

There is a total of 180 degrees in a triangle.

2x-10+70+x+30=180

3x+90=180

3x=90

x=30

Plug in 30 to the measure of angle A

2(30)-10

60-10

50

Answer 2

50

Explanation:

The sum of the angles of a triangle add to 180 degrees

A + B + C = 180

2x-10 + 70+ x+30 = 180

Combine like terms

3x +90 = 180

Subtract 90 from each side

3x+90-90=180-90

3x= 90

Divide by 3

3x/3= 90/3

x=30

We want to find angle A

A = 2x-10

=2*30 -10

=60-10

50