reflec about line

主題：反射

Drag segment to see the circles' reflect about line. The distance of each circle to line is equal to distance of its reflect to line. .Direction of the movement of reflect is changed

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Circumcenter
A trigonometric function (solve an equation)
Rigid trapezoid instead of dinamic one
CCSS ALG 5.5 Linear Regression #2
Dandelin Spheres (how the various geometric definitions tie together!)

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拋物線
平行四邊形
平移
Pythagoras or Pythagorean Theorem
內切圓

reflec about line

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