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Q: What is the surface area of a cone if the height is 21 and the diameter is 19?

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A cone with height 24 and the base diameter 7 has a surface area of 305.17 units2

Total surface area of cone = (pi*radius*slant height) + (pi*radius2) Area = (pi*12*21) + (pi*122) = 1244.070691 or about 1244 square m

This cone has a lateral surface area of approximately 226.73cm2

Surface area is 188.5 feet2

A right cone with a radius of 4 and a slant height of 13 has a total surface area of about 213.63 units2

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Total surface area of cone = (pi*radius*slant height) + (pi*radius2) Area = (pi*12*21) + (pi*122) = 1244.070691 or about 1244 square m

Now that depends on if you mean outside surface area. A cone has an inside surface area too. Just adding my two cents. Not even good at math. But I can debate a point til the death!

This cone has a lateral surface area of approximately 226.73cm2

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