You find the area of base then multiply by height so you do 9x9x3.14 and then times that by12 again, equation, 9x9x12x3.14=.im too lazy to do the rest, just use a calculator I guess
P = s + (s + 5) + (s + 5) This represents the two sides that are 5 inches longer than the base (s + 5) and the base (s). Simplifying. 100 = 3s + 10 subtract 10 from both sides 90 = 3s divide both sides by 3 30 = s base = 30 sides = 35