Asked by Emilly

I want to know how to calculate the radius, Im very confused.

The cones below are similar, although not drawn to scale
(smaller cone) (larger cone)
height is 12 ft height is 15 ft
radius is 8 ft radius not given

What is the lenght of the radius of the larger cone?

a= 10ft
b=11ft
c=12ft
d=13ft

Answered by Anonymous
What Is the surface area of the larger cone then I can give the answer
Answered by Emilly
It doesnt say.
Answered by Anonymous
well then I'm sorry I can not answer your question. I need the height (which you gave me) and the surface area.
Answered by Emilly
how do i find the surface area, all i have is the height :(
Answered by Anonymous
How to Find the Surface Area of Cones - If You Know the Radius and Slant Height

Set up the formula for the surface area of the cone.

Plug the value of the radius into the formula.

Plug the value of the slant height into the formula.

Calculate the lateral surface area of the cone ( (π) (r) (s) {display style (pi ) (r) (s)})
Answered by Anonymous
I cant really help you as much as a teacher can because I'm a student myself
Answered by Reiny
very simple, no need for surface area and such ...

r : 8 = 15 :12 , since the sides of similar shapes are proportional
r/8 = 15/12 = 5/4
4r = 40
r = 10
Answered by that guy in a dog costume
yep just took test it's 10
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