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Orthocentre

Author:Big Lee

New Resources

撒针估算面积实验
直線的斜率
斜率的值
圓周公式的應用
平行線的判定

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test
長方體的切割(一)
圓上圓
半圓五角形滑動
少数派Pi

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Polygons
Sequences and Series
Coordinates
Rotation
Isosceles Triangles

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