Question

What do you notice about the ratio of the distance around the circle to the distance across the circle for each circle?

Answer 1

Remember that

the circumference of a circle is equal to

`C=\pi\cdot D`

the distance across the circle is equal to the diameter D

so

the ratio is equal to

`\text{ratio}=(C)/(D)=(\pi\cdot D)/(D)=\pi`

For each circle the ratio is equal to the number pi