algebra
posted by Monique on .
Suppose you have a can of paint that will cover 400 ft squared. A. find the radius of the largest circle you can paint. Round to the nearest tenth of a foot.( hint use the formula A=3.14 times radius squared
B. Suppose you have two cans of paint, which will cover a total of 800 ft squared find the radius of the largest circle you can paint round to the nearest tenth of A foot

For the area of a circle is πr² as you stated so all you do is set 400 equal to πr² and solve for r.
400=πr²/π
127.32=r²
√127.32)= r
r=11.3
Same thing for this except you use 800 instead of 400 so.
800=πr²
254.64=r²
√254.64)= r
r=15.9 or 16.0 for rounding purposes.