Question

Find measure of angle A

Answer 1

116°

Explanation:

3x-4+9x+17+6x-31=180

18x-18=180

+18 +18

18x=198

18x/18=198/18

x=11

a=9x+17

a=9(11)+17

a=99+17

a=116°

hopefully this helps :)

Answer 2

Angle A : 116°

Further explanation

The sum of all the angles in the triangle is 180°

∠A+∠B+∠C=180°

`\tt 9x+17+3x-4+6x-31=180\\\\18x-18=180\\\\18x=198\\\\x=11\\\\A=9.11+17=116^0`