Two cones are similar

Cone 1 r=5 h=15
Cone 2 r=? h=18
What is the length of the radius of cone 2?
is it 7?

3 answers

I'm also having trouble with this:
A cone has a radius of 40 cm and a volume of 1875 cm cubed what is the volume of a similar cone with a radius of 16 cm?
I think it's 113 m squared but I'm not sure.
It's okay guys I figured it out. I failed and it gave me the right answers.
good. Do you know how they arrived at the right answers?
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