Question

I did everything but I got confused on finding m

Answer 1

We can see that ∠ACB and ∠ACD are supplementary angles. This means they have a sum of 180 degrees. If ∠ACD is 108 degrees, then ∠ACB can be found through this equation:
`180 - ACD = ACB`

-->
`180 - 108 = ACD`

This means that ∠ACB is 72°.