Question

Irene wants to give a candle to her sister as a gift. She is making a canister to put the candle in. The template of the canister is shown below.

The radius of the top of canister is 7 centimeters and its height is 15 centimeters. How much cardboard does Irene need to make the canister? (Use 3.14 for .)
A.
967.12 square centimeters
B.
639.42 square centimeters
C.
815.26 square centimeters
D.
637.42 square centimeters

Answer 1

S = 2π(7^2) + π(7)(15) = 637.42 square cm.

D is correct.

The exact surface area is 203π square cm., or about 637.74 square cm.