Question

in the formula $v = pi\times r^{2}\times h$, $r^{2}$ stands for

the approximate value of $pi$ used in calculations is

the volume of a cylinder can be expressed in units of

Explanation:

1. In the formula for the volume of a cylinder $V=\pi\times r^{2}\times h$, $r^{2}$ is the square of the radius of the circular - base of the cylinder. It represents the area of the circular base when multiplied by $\pi$.
2. The approximate value of $\pi$ used in calculations is 3.14. $\pi$ is an irrational number, and 3.14 is a common approximation for ease of calculation.
3. The volume of a three - dimensional shape like a cylinder is expressed in cubic units (e.g., cubic centimeters $cm^{3}$, cubic meters $m^{3}$) because it measures the amount of space occupied in three - dimensional space.

Answer:

1. The square of the radius of the circular base of the cylinder
2. 3.14
3. Cubic units (such as $cm^{3}$, $m^{3}$ etc.)