1) Since the sum of interior angles yields 180º, no matter which type of triangle it is.
2) Then we can write
3x+12 +x +6x +8 = 180
10x +20 = 180º
10x = 180-20
10x = 160
x= 16
2.2 Let's find out the measurement of each angle
m∠ A= x Plug into that the value of x
m∠ A = 16º
m∠B= 3x+12 Plug into that the value of x
m∠B = 3(16) +12
m∠B = 48+12
m∠B =60
3) Then the answers are:
x = 16
m∠ A = 16º
m∠B =60