Question

Find x. Then find the measure of angles A, B and C.

Answer 1

x= 11

A=59

B= 37

C = 84

Explanation:

A triangle adds up to 180 °.

So the equation will be a °+ b° + c° = 180°

Next, you combine like terms.

`6x + 3x + 9x+4-15-7 = 180\\18x-18=180`

Then inverse operation,

`18x-18=180\\18x=198\\x=11`

After to get a, b, and c you just need to plug in x.

`6(11)-7=a\\3(11)+4 = b\\9(11)-15=c`