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周界

Author:asderic, Anthony OR 柯志明

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兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
拼砌四邊形
画直线等分三角形的面积

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兩直線夾角101.11.21
拋物線標準式101.11.22
clock
四邊形的「等角分點」
利用按鈕控制動畫On/Off

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Vectors 2D (Two-Dimensional)
Mathematics
Arithmetic Operations
Vectors
Similar Triangles

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