Question

if the cirumference circle is 6.28 what is the area of the circle

Answer 1

6.28 what?

Answer 2

The circle is 6.28

Answer 3

6.28 units, I guess.
\[Circumference = 2 \pi r\]
\[Area = \pi r^{2}\]

'r' is the radius of the circle, in some unit.

Solve for 'r' using the circumference formula.
Then, use what you found for 'r' in the area formula.