Question

I NEED HELP I DONT UNDERSTAND​

Answer 1

answers are given below

Explanation:

1.

Circumference =
`2\pi r`

Where 2r = Diameter

Hence

Circumference =
`\pi * Diameter`

2.

No there is no such circle in which relationship between Radius and Diameter can be represented without
`\pi`.

This is because while deriving the relation the angle measurement ts taken into consideration and the angle are measured in radians i.e. in terms of
`\pi` not degrees.

3. We can not determine the exact circumference because
`(22)/(7)` is a rational number and but its value is approximately taken from
`\pi` and
`\pi` is an irrational number