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
a bowling ball measures 264cm in circumference. What is the volume of the smallest cube that will hold this ball?

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