Question 1070797
Find the radius of one third of a circle (one third is removed from the circle) with an area of 800cm squared
=========
Your post is not clear, but:
----------
If 1/3 has an area of 800 cm^2, the circle has an area of 2400 cm^2
-----
{{{Area = pi*r^2 = 2400}}}
{{{r^2 = 2400/pi}}}
Solve for r.