geometry/algebra
posted by Nancy on .
I asked this question yesterday, and I'm trying to understand it since I got the wrong answer  please explain:
You need to make a soda can with a volume of 29 cubic inches.
Find the surface area. calculate the following:
a) How much material is needed if the can's radius is 1 inch?
I figured it this way:
Let the height be h
volume = π r²•h
29 = π (1²) • h
h = 29/π
So πr² • 2 + 2π • 29/π
2π + 58 = 64.28 in²
but person who helps me gets it this way:
Let the height be h
volume = π r²h
π (1²)h = 29
h = π /29
the surface area are
= 2 π r²+ 2 π rh
= 2 π (1) + 2 π (1)( π /29)
= 6.96 in²
Can anyone help me and tell me which is correct? I think the problem may
be that I get the volume 29/╥
intead of ╥/29

π (1²)h = 29
If you divide both sides by π, you get:
h = 29/π