### Home > PC > Chapter 6 > Lesson 6.1.1 > Problem6-16

6-16.

Determine the radius when the cone is filled.

$\frac{3}{5}=\frac{r}{10}$

Set up and solve a proportion relating the area with the rate of evaporation.

$\frac{9\pi}{0.2}=\frac{36\pi }{x}$

When the cone is full, it has 120π m3 of water in it.
What is the volume of water in the cone when it is half full?

Calculate r when the cone is half full. Then set up a proportion with area and evaporation rate similar to the one in part (a).