Two similar cones have matching heights and radii whose lengths are in the ratio 7:1 Find the ratio of their surface areas.

surface area is πr(r+h2+r2)

Step-by-step explanation:

surface area is 8

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: