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Thank surface area of a sphere is radius is 5 cm and 5 times the curved surface area of a cone of radius ,4:find the heaight volume of cone



Surface area of sphere = 4πr² =100π.
∴ Curved surface area of cone = 100π/5 = 20π.
∴ π×r× \sqrt{( x^{2}+ r^{2}  )} =20π.
⇒4× \sqrt{( x^{2}+ 4^{2}  )} =20.
Volume = 16π.(Ans.) 
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