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3 years ago

what is the surface area of a cone with a radius of 7 feet and a slant height of 9 feet? using 22/7 for pi

Mathematics

1 answer:

olga55 [171]3 years ago

4 0

Answer:

Surface area of the cone =352 feet²

Step-by-step explanation:

To calculate the surface area of a cone, we will use the formula;

Surface area of a cone = πr² +πrl

where r denotes the radius of the cone and l denotes the slant height of the cone.

From the question given

radius r =7 slant height l=9 and π =22/7

we can now proceed to insert the variables into the formula and then solve

Surface area of a cone = πr² +πrl

=22/7 × 7² + 22/7 × 7×9

= 22/7 × 49 + 22/7 × 63

=154 + 198

=352 feet²

Surface area of the cone =352 feet²

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