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perimeter

Author:wongwk, Tim Brzezinski

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球體建築師
直角坐標平面上的旋轉變換
Nested spiral octagon
近似值：有效數字
找出對稱軸

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圓環
GGB3
教學媒體
扇形滚动(圆心角半径可变)
Earth with coastline

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Kite
Sine
Straight Lines
Confidence Interval
Optimization Problems

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