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包絡橢圓
Author:
Wu Xiao-Ren
Topic:
Ellipse
操作說明:
1. 拖曳A點,則切線s可以包絡出橢圓(所有切點的軌跡).
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四邊形的特性
兩位數加法
畫出對稱圖形
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
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國中數學
坐标变换
勒洛三角形頂點B軌跡
禪繞畫2
运动
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