Question

The radius and slant height of a cone are in ratio 4:7.If its curved surface area is 792cm.find its radius?​

Answer 1

Step-by-step explanation:

let the ratio be x

radius = 4x

height =7x

2πr

=CSA

3.14×2 ×4x×7x=

Answer 2

Answer:

r = 12 cm

Step-by-step explanation:

let radius be 4x and slant height be 7x

given that,

CSA = 792

$\pi \: r \: l = 792$

22/7 x 4x x 7x = 792

22 x 4x x x = 792

22 x 4x^2 = 792

x^2 = 792/22x4

x^2 = 198/22

x^2 = 9

x =√9

x = 3

therefore radius = 4 x x

= 4 x 3

= 12 cm

also slant height = 21 cm