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A cone has same volume with a cylinder which is 5 cm high. If they have same area of the
bases and the cylinder has volume 451 cm", find the area of the surface of the cone

Sagot :

ilyons40

Answer:

Step-by-step explanation:

Remember, the formulas for the lateral surface area of a pyramid is 12pl and the total surface area is 12pl+B .

Since the base of a cone is a circle, we substitute 2πr for p and πr2 for B where r is the radius of the base of the cylinder.

So, the formula for the lateral surface area of a right cone is L.S.A=πrl  , where l is the slant height of the cone.  

Find the lateral surface area of a right cone if the radius is 4 cm and the slant height is 5 cm.

L.S.A=π(4)(5)=20π≈62.82  cm2

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