# A tube has a radius of 3 inches and a height of 7 inches. What it's approximate volume?

$$197.92 in^{2}$$

Explanation

The volume of a tube is given by the formula $$V=\pi r^{2} \times h$$ where r is the radius of the tube and h is its height. By definition, $$\pi$$ is approximately 3.14 so:
$$V = 3.14 \times {3^2} \times 7 = 3.14 \times 9 \times 7 = 197.92 { in^2 }$$