pi X 25 = 25 pi ( Algebraic.
However, if you approximate pi to 3.14159
Then 3.14159 x 25 = 78.53975
If you approximate pi tp 3.13
Then
3.14 x 25 = 78.5
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The best answer is 25π. You can approximate pi as a decimal as 3.14159. In that case, 25π ~= 78.53975
The circumference is Pi x r x r.... In THIS case it's .25 x .25 x Pi... which equals 0.19634375
Area of Circle = pi x r^2 = pi x 25 x 25 = pi x 625 If you need a decimal answer multiply 625 x 3.14159
78.50
25 x pi sqft
Yes. 2 x 3.14 = 6.28 = 6 7/25 = 157/25 which is rational. If you are using 3.14 as an approximation to {pi}, then 2 x {pi} is not rational.