Question

Surface area of cones quick check
What is the surface area in square inches of a cone with a radius of 10 inches and a slant height of 15 inches use 3.14 for pi

Answer 1

The surface area \( A \) of a cone can be calculated using the formula:

\[
A = \pi r (r + l)
\]

where:
- \( r \) is the radius of the base,
- \( l \) is the slant height.

Given:
- \( r = 10 \) inches,
- \( l = 15 \) inches,
- \( \pi \approx 3.14 \).

Now, substituting the values into the formula:

\[
A = 3.14 \times 10 \times (10 + 15)
\]
\[
A = 3.14 \times 10 \times 25
\]
\[
A = 3.14 \times 250
\]
\[
A = 785
\]

Therefore, the surface area of the cone is \( 785 \) square inches.