Subtract 8/10 from 4/10 but just the numerator (the top number) and you will get 4/10
One may note, you never quite asked anything per se, ahemm, if you meant simplification.
What is it that we need to find?
Answer:
1.5 inches
Step-by-step explanation:
56.52/ 8 = 7.065
7.065 / pi =2.248859346
square root of 2.248859346 = 1.5
r = 1.5