The Japanese 5 yen coin has a hole in the middle.
What are the possible ways to calculate the difference
between the distances from the outer edges and the
inner edges of the coin? Check all that apply.

Subtract the two diameters and multiply by it
Calculate the circumference of the coin.
Add the two diameters and multiply by i
Subtract the circumference of the hole from the
circumference of the coin.
Calculate the radius of the hole.