Ok so for 18 you take 65 times pi so - 65 * pi = 204.1 which thats the volume. so keep that in mind. now if im correct you would take 204.1 (v) and divide it by 5 (h) to find B. so 204.1 / 5 = 40.82. Now check with the V=Bh formula which with our numbers would be 204.1=40.82 * 5 which is correct. so B=40.82
Now for 19: so imma do a long version of what i would do. We will use t for triangle and r for rectangle and s for the overall shape.
The equation i would use would be: s-t=r which plug in the numbers is 44-20=r
If by my equation and my understandings are right, R=24 square inches.
