Question

Question #ccab4

Answer 1

I am not sure I got your question right but I tried this:

Explanation:

The Circumferece is given as: `color(red)(C=2pir)`:
you have:
`C=16pi`
so introducing it into the above expression:
`16pi=2pir`
rearranging:
`r=(16cancel(pi))/(2cancel(pi))=8cm`

Answer 2

`16pi=50.625` see explanation

Explanation:

Where does the`2r` come in?
You don't always get a 2r in the question.
The `16pi` without `2r` is just there to confuse you.
They could have used 50.625 as the circumference instead of `16pi`
`16 xx pi=50.625.`