Question

If m angle acd = 120- x, m angle b = 60, and m angle a = 10 + x, find m angle acb

Answer 1

this question uses the exterior angle of a triangle postulate

The exterior angle ACD = Angle A + Angle B

so using the information

120 - x = 60 + x + 10

so 1st you need to solve for x.

the you can get the angle measures

an from there find the value of the angle you need.

Answer 2

I got x=25?

Answer 3

that's the correct value fox, now you can find the size of Angle ACB