Posted by Sydney on Wednesday, January 19, 2011 at 8:23pm.
A cylinder has surface area of 402 cm2. The height is three times greater than the radius.
What is the height of the cylinder?

Cylinder Height  helper, Wednesday, January 19, 2011 at 8:40pm
r = radius
3r = height (h)
SA = 2(pi)(r)(h) + 2(pi)(r^2)
SA = 2(pi)(r)(3r) + 2(pi)(r^2)
SA = 6(pi)(r^2) + 2(pi)(r^2)
SA = 8(pi)r^2
402 = 8(pi)r^2
402 = 8(3.14)r^2
402 = 25.12r^2
16.00318 = r^2
rounding 16.00318 = 16
16 = r^2
r = 4
height = 3r = 3(4) = 12

Cylinder Height  Sydney, Wednesday, January 19, 2011 at 8:44pm
thx

math  Anonymous, Monday, January 14, 2013 at 9:39pm
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