Because you might have to measure a cylider, such as the capacity of fluid oz's in a can of soda and maybe you have a room and it's shaped as a circle u might wanna find how much carpet u need...? sorry, im not sure if I'm helping! :( I covered area 3 years ago!!
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Pi * R squared, where R is the radius of the circle in question
Divide the area by pi then square root your answer which will give the radius of the circle and use 2*pi*radius to find the circumference.
It says so in the formula
You would have to round since area will not be able to be represented without rounding.
Assuming that 1inch is your diameter, your radius is, of course, 0.5. Since the area of a circle is expressed asA=(pi)r2simply plug in the radius to this equation. You will get your area to be pi*0.25in2, which is roughly equal to 0.78539inches2.