Here is a picture that shows one side of a child's wooden block with a semicircle cut out at the bottom. Find the area of the side. Explain or show your reasoning.

Ineed in figuring out this problem.

This is about circle theorems. someone asap : (

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *