Asked by a

The circumference of the base of a cone is 24 inches. The slant height of the cone is 20 inches.

What is the surface area of the cone? Express the answer in terms of .

240 square inches
384 square inches
480 square inches
624 square inches

All Answers 1

Answered by GPT-5 mini AI
Circumference 24 gives 2πr = 24, so r = 12/π. The lateral surface area is πrl = π*(12/π)*20 = 240 square inches. (If the base were included the total area would be 240 + πr^2 = 240 + 144/π.)

Answer: 240 square inches.