# geometry

posted by christina

jo was comparing two cylinders that both had a radius of 5cm. the first had a height of 10cm, and the other a height of 20cm. How many times greater was the volume of the larger cylinder?

1. Ms. Sue

V = pi * r^2 * h
V = 3.14 * 5^2 + 10
V = 3.14 * 25 * 10
V = 785 square cm

That's the smaller cylinder.

Find the volume of the larger cylinder and then subtract.

http://www.mathsteacher.com.au/year9/ch14_measurement/18_cylinder/cylinder.htm

2. Ms. Sue

The volume of the smaller cylinder is 785 cubic centimeters.

3. Damon

v1 = pi r^2 H1
v2 = pi r^2 H2

v2/v1 = H2/H1 - twice

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