Question

The volume of a cylinder, found using 3.14 to approximate pi, is 50,240 cm3. The radius of the cylinder is 40 cm.

What is the height of the cylinder?

Express your answer as a whole number.

_____cm

Answer 1

50,240 / 80 (I got 80 from doing 40 times 2)
that is 628
628/3.14
that is 200
the height is 200 cm

Answer 2

V = pi * r^2 * h

Plug in what we know:

50240 = 3.14 * 40^2 * h

Simplify the exponent:

50240 = 3.14 * 1600 * h

Multiply:

50240 = 5024h

Divide 5024 to both sides:

h = 10