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Find the surface area of a cone with radius 5 ft and height 21 ft substitute pi for 3.14​

User Twils
by
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1 Answer

5 votes

Answer:

417.4ft^2

Explanation:

Surface area of a cone = πr(r+√r²+h²)

r is the radius

h is the height

Substitute

Surface area of a cone = π(5)(5+√5²+21²)

Surface area of a cone = πr(5+√25+441)

Surface area of a cone = π(5)(5+21.59)

Surface area of a cone = 3.14*5*26.59

Surface area of a cone = 417.4ft^2

Hence the surface area of the cone is 417.4ft^2

User Pritesh Tupe
by
8.5k points

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