Question

Which is the total surface area of this cone?

A. 219.80 square centimeters
B. 219.98 square centimeters
C. 220.18 square centimeters
D. 220.78 square centimeters

Answer 1

A. 219.80 square centimeters

Explanation:

The total surface area is given by ...

A = πr(r+s)

where r is the radius and s is the slant height. Filling in the given numbers, you get ...

A = 3.14·(5 cm)·(5 cm +9 cm) = 219.80 cm²