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垂直線的斜率
Author:
Anthony OR 柯志明
拖拉紅色 C 點，令兩線垂直。 兩垂直線的斜率有甚麼關係？
柯志明 香港 GeoGebra 學院
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All reflections
[eqc]: aproximate root 3-rd order - [gm]
Tangent-Secant angle at Radius
testfileTue Mar 19 23:58:03 CET 20190.4857513598412295
Reflection4a
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