Answer:56.556cm^2
Explanation:
okay so you need to find out the area of the bigger circle (the 20cm one)
the area of finding a semi circle is (πxR^2)/2
so we do 3.142x10^2 and then divide it by 2 to get 157.1cm^2
then we do this for another semi circle so we do 3.142x8^2 and divide it by 2 to get 100.544cm^2
so then to finish it off we do 157.1-100.544 to get 56.556cm^2