Question

0. The radius and the slant height of a cone are in

the ratio of 4 : 7. If its curved area is 792 cm2

,

then its radius will be -​

Answer 1

Hey mate,

let the ratio be 4x and 7x ( common multiple be x)

thus, c.s.a of a cone = πrl

792= 22/7× 4x ×7x

792 = 88x²

x²= 9

x= ± 3

but, measurement cannot be negative .

thus, x= 3

radius = 4x= 12 cm