A cone shaped megaphone has a radius of 15 cm in a slant height of 20 cm. A megaphone has an open bottom. That what is the lateral surface area of a megaphone, square centimeters? Use 3.14 for pi.
1. 942 square centimeters.
2. 1884 square centimeters.
3. 1648.5 square centimeters.
4. 109.9 square centimeters.
The lateral surface area of a cone can be found using the formula:
Lateral surface area = π * radius * slant height
Plugging in the given values:
Lateral surface area = 3.14 * 15 cm * 20 cm
Lateral surface area ≈ 942 square centimeters
Therefore, the correct answer is option 1. 942 square centimeters.