A jar is filled with water to a height of 10 cm. The diameter of the jar is 6 cm. If water is added to the jar until the height reaches 20 cm, what is the increase in volume of the water in the jar?
To find the volume of a cylinder, use the formula: $$V = ext{height} imes ext{base area}$$
First, calculate the base area using the radius: $$ ext{base area} =\frac{22}{7} imes r^2$$ where $$r =\frac{d}{2}$$ and $$d$$ is the diameter of the jar.