a cone-shaped megaphone has a radius of 15 centimeters and a slant height of 20 centimeters. A megaphone has an open bottom. What is the lateral surface area of the megaphone, in square centimeters? use 3.14 pi.
a 1,884 square centimeters
b 1,648.5 square centimeters
c 109.9 square centimeters
d 942 square centimeters
The lateral surface area of a cone can be found using the formula A = πrs, where r is the radius and s is the slant height.
In this case, the radius is 15 centimeters and the slant height is 20 centimeters.
Plugging these values into the formula, we get:
A = 3.14 * 15 * 20
A = 942 square centimeters.
Therefore, the lateral surface area of the megaphone is 942 square centimeters, so the answer is d) 942 square centimeters.