Find the area of the iron sheet required to prepare a cone 20 cm high – InterviewSolution

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1.	Find the area of the iron sheet required to prepare a cone 20 cm high with base radius 21 cm.
Answer» Solution :R = 21CM, h= 20cm therefore `l= sqrt(r^2+h^2) = 29CM` therefore Area of the SHEET = total surface area of the cone =`pi rl+ pi r^2 = pi r(l+r)` =`(22)/7 xx 21[29+21]` = `3300 cm^2`

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