What is the circumference of a circle if the area is 300 sq centimeters

So where you want to start is the basic calculation, Area =  r, but work backwards, since you already know your area.

A=r
300cm = (3.14159)(r)^2

Now divide area (300) by pi.

95.49297 = r

then find the square root of the number on the left side of the (=) sign (95.49297). You should get:

9.77205 = r

Now that you know your radius, you can plug this value into the basic circumference calculation, c = 2(pi)r.

c = 2(pi)9.77205
c = 61.3996

Simplify the amount of numbers after the decimal, and remember the value is no longer measured in cm/squared, but just cm because we're now talking about length.

Good luck!