Help please.

C. 12

Step-by-step explanation:

To change triangle PQR to XYZ you divide by 4. This can be seen in the change from 12 to 3 on the left side of the triangle. So, you divide 20 by 4 and get 5 and then divide 16 by 4 and get 4.

12/4=3

20/4=5

16/4=4

So, you add these values together to get the perimeter of 12.

I hope this helped!

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.