What is the area of a circle if the diameter is 9 cm?

1 Answer
Martha W.
Jun 25, 2017

#A=20.25 pi or 63.62 cm^2#

Explanation:

The area of a circle is represented by the formula #A=pi r^2#.

If the diameter is #9 cm#, the radius is #4.5 cm#.

So #A=pi r^2 or A=(4.5)^2 pi#

#A=20.25 pi cm^2 or 63.62 cm^2#

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