Question

Can you explain this the way to get this answer

Answer 1

For this case we have the following info :

l= 18.5 ft

D= 20 ft

r= 20/2 = 10 ft

The surface area is given by;

`SA=\pi r(l)=\pi\cdot10ft\cdot(18.5)=581.194ft^2`

Then the answer is:

581 ft^2