Question

The sand at the bottom of an hourglass has the approximate shape of a cone with a diameter of 9.85 cm and a height of 6 cm.

Which estimate best approximates the volume of the sand?

160 cm³
380 cm³
470 cm³
630 cm³

Answer 1

divide the diameter by 2 to get the radius and then plug into cone volume pi*r^2*h/3 which is a bit under 160 so the answer is A

Answer 2

What is volume?

To calculate the volume of the sand, we use the formula below.

Formula:

• V = πr²h/3..................... Equation 1