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Karolina [17]
2 years ago
12

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

Mathematics
1 answer:
Kryger [21]2 years ago
4 0

Answer:

<u>417.4ft^2</u>

Step-by-step 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 <u>= 417.4ft^2</u>

<u>Hence the surface area of the cone is 417.4ft^2</u>

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