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The radius and the slant height of a cone are in the ratio 7:13 and the curved surface area is  Find its radius

A

5 cm

B

7 cm

C

8.8 cm

D

10.3 cm

Answer

Let 
Curved surface area CSA=286 
But CSA=

or 
or x=1
r=7 cm
Diameter d=14 cm

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