Question

The surface area S of a cylinder is given by the formula S = 2 π rh + 2 πr^2
Write the formula for S in terms of the radius if the height of the cylinder is 5 more than 3 times its radius. keep the answer as S=....
Use the symbol for pi (distribute out and write answer as an expanded polynomial)

Answer 1

S = 2 π r(3r+5) + 2 πr^2

Answer 2

so, expanded, that is
S = 8πr^2 + 10πr

Answer 3

4