To find the lateral surface area of the cone-shaped megaphone, you can use the formula:
\[ \text{Lateral Surface Area} = \pi r l \]
where:
- \( r \) is the radius of the base of the cone,
- \( l \) is the slant height of the cone,
- \( \pi \) is approximately 3.14.
Given:
- \( r = 15 \) cm
- \( l = 20 \) cm
Substituting the values into the formula:
\[ \text{Lateral Surface Area} = 3.14 \times 15 \times 20 \]
Now, calculating the expression step-by-step:
- Calculate \( 15 \times 20 \):
\[ 15 \times 20 = 300 \]
- Now, multiply by \( \pi \):
\[ \text{Lateral Surface Area} = 3.14 \times 300 = 942 \]
Thus, the lateral surface area of the megaphone is:
\[ \text{Lateral Surface Area} = 942 \text{ square centimeters} \]
Therefore, the correct answer is:
942 square centimeters.