Question

Question #0f210

Answer 1

`"1 cm"`

Explanation:

We know

`"circumference" = 2* pi* "radius"`

OR

`2*pi=2*pi*"radius"`

OR

`"radius" = (2*pi)/(2*pi)`

OR

`"radius = 1 cm"`

Answer 2

`"radius "=1`

Explanation:

`"the circumference (C ) of a circle "=2pir`
`"where r is the radius"`

`rArrC=2pir=2pi`

`"divide both sides by "2pi`

`(cancel(2pi) r)/(cancel(2pi))=cancel(2pi)^1/cancel(2pi)^1`

`rArrr=1`