Exercise60

A circle’s circumference formula is $$C=2\pi r\text{,}$$ where $$C$$ stands for circumference and $$r$$ for radius. And a circle’s area formula is $$A=\pi r^2\text{,}$$ where $$A$$ stands for area and $$r$$ for radius.

Use those two formulas to answer the following questions about a circle with radius $${4\ {\rm m}}\text{.}$$

1. This circle’s circumference, in terms of $$\pi\text{,}$$ is .

2. This circle’s circumference, rounded to the hundredth place, is .

3. This circle’s area, in terms of $$\pi\text{,}$$ is .

4. This circle’s area, rounded to the hundredth place, is .

in-context