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No
approx 12.5664r
one half multiplied by four multiplied by pie multiplied by the radius squared
3.14 multiplied by 21 is 65.94
circumference = pi multiplied by the diameter
1. The diameter multiplied by pie. 2. The radius multiplied by 2 multiplied by pie. 3. The area divided by pie, the square root of that answer then multiplied by 2 then multiplied by pie.
pie multiplied by twenty five = 78.53981634
No
approx 12.5664r
35.904pi or 112.79574...
one half multiplied by four multiplied by pie multiplied by the radius squared
5193.05265638
The diameter multiplied by (pi)2 . That's about 9.87 times the diameter.
The formula is pi multiplied by the diameter
3.14 multiplied by 21 is 65.94
Pie is sweet and 3.14
circumference = pi multiplied by the diameter