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प्रश्न
Find the curved surface area of a cone whose height is 8 cm and base diameter is 12 cm .
उत्तर
Diameter = 12 cm ⇒ r = 6 cm
Curved surface area = `(pir sqrt(h^2 + r^2))`
= `22/7 xx 6 xx sqrt(8^2 + 6^2)`
= `22/7 xx 6 xx sqrt(100)`
= `22/7 xx 6 xx 10`
= 188.57
Curved surface area = 188.57 cm2
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