about maths(very easy but forget it)
回答 (2)
2006-11-04 2:56 am
✔ 最佳答案
area of circle:radius X radius X 3.14 or 22/7
2006-11-04 2:52 am
A = pi * (r^2)
r = radius
2006-11-04 20:46:59 補充：
pi is approximately equal to 3.1415 or 22/7. But for a more accurate answer, better use the build in pi value in the calculator.
r = radius
2006-11-04 20:46:59 補充：
pi is approximately equal to 3.1415 or 22/7. But for a more accurate answer, better use the build in pi value in the calculator.
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