81 x 355/113 = 254.47 to 2 places of decimals
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When you multiply 12.8 times pi the exact answer is12.8 Pi, but you can round off the answer to40.192because pi is about equal to 3.14.
pi times radius or diameter equals are of a cirlce
The circumference is 56.55 cm
Circumference is 2 times pi times radius, so the circumference of this circle is 2 times pi times 5, or 10 times pi. If a decimal answer is needed, pi is approximately 3.14, so C=31.4
The area is 9 feet. You find the square root of 81 which is 9. I want circumference, not area.