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प्रश्न
The radius and slant height of a cone are 5 cm and 20 cm respectively. Find its curved surface area. (Π = 3.14)
उत्तर
r = 5 cm, l = 20 cm
∴ Curved surface area = `pirl`
= 3.14 x 5 x 20
= 3.14 x 100
= 314 cm2
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