1 Answer

Ravikumar B · Answer 1 · 2021-09-18T01:48:24+0000

Given:

Radius of the cone = 5 ft

Slant height of the cone = 21 ft

To find:

The surface area of the cone

Solution:

Surface area of cone formula:

$SA=\pi r^(2)+\pi r l$

where r is the radius and l is the slant height.

$SA=\pi * 5^(2)+\pi * 5 * 21$

$SA=\pi * 25+\pi * 105$

$SA=25 \pi+ 105 \pi$

$SA=130 \pi$

The surface area of the cone is 130π square feet.

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