Alex Berkovsky
04-05-2011, 8:09 PM
My kid has a geometry problem to solve and I am not much help. Here's what's given:
Find the radius and height of a cylinder if the height is 3 less than the radius and TSA=70π (Pi)
I got this far and that's all I remember from my last geometry class 33 yrs ago.
TSA = 2πr(r+h)
70π = 2πr(r+h)
70π = 2πrh+2πrē
70π = 2πr(r-3)+2πrē
70π = 2πrē-3r+2πrē
70π = 4πrē-3r
Find the radius and height of a cylinder if the height is 3 less than the radius and TSA=70π (Pi)
I got this far and that's all I remember from my last geometry class 33 yrs ago.
TSA = 2πr(r+h)
70π = 2πr(r+h)
70π = 2πrh+2πrē
70π = 2πr(r-3)+2πrē
70π = 2πrē-3r+2πrē
70π = 4πrē-3r