Question

Calculate the volume of a cylinder with height 9cm and diameter 15cm.

Give your answer rounded to 3 SF.

Answer 1

1590cm³

Explanation:

The volume of a cone = base area x height

V= π x (d/2)^2 x h

V = 22/7 x 56.25 x 9

V ≈ 1591.071429cm³

V = 1590cm³ to 3 sf

Answer 2

The formula for the volume of a cylinder is:
V = π x r^2 x h, v being the volume, r being the radius and h being the height.

We already have the height, and a diameter of 15cm is equal to a radius of 7.5cm.

So if we put these numbers into the formula:
V = π x (7.5)^2 x 9
V = π x 56.25 x 9
V = π x 506.25
V = 1590.431280…
V = 1590