18/25 is already simplified. There is no number that can go in both 18 and 25.
Answer:
See explanation
Step-by-step explanation:
You forgot to give the coordinates of C.
Note that, the mapping for 90° clockwise rotation around the origin is given by:

Assuming the coordinates of C were (-6,6), then the coordinates of C after a 90° clockwise rotation
around the origin is (-6,-6)
6.25 is the answer to the problem
O=210/15=14
I hope I was helpful