Question

The volume of a cylinder is 770 cm. It's height is 5 cm. Find its approximate radius.

7 cm
14 cm
9 cm
3.5 cm

Answer 1

Hey there,

The equation for the volume of a cylinder is V = πr²h.

The first step into finding the radius is to plug in what you already know into the equation:

• 770 = πr²5

We divide both sides by 5:

• 154 = πr²

Now we divide both sides by π:

• 49.0197224723 = r²

Finally we just do the square root of 49.0197224723:

• 7.0014086063 = r

The radius therefore would be about 7cm.

Hope I helped,

Amna