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प्रश्न
The radius of a cone is 5 cm and vertical height is 12 cm. Find the area of the curved surface.
उत्तर
Given,
Radius of cone = 5cm = r
Height of a cone =12cm=h
Slant height of the cone= `sqrt(r^2+h^2)`
`= sqrt(5^2+12^2)=13cm`
∴Curved surface Area = `pirl`
`=22/7xx5xx12`
= `204.28cm^2`
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