Answer:

Explanation:
If AB is diameter, the angle opposite to it, when a triangle is inscribed in that semi circle, will be 90 degrees.
Given that:
AB is the diameter.
According to what is given, we come to know that <ACB = x = 90°.
![\rule[225]{225}{2}](https://img.qammunity.org/2023/formulas/english/college/eq413d752mwtrwwenrzwldxt4w1olmf1b3.png)
Hope this helped!
~AH1807