Special Quadrilaterals with copies

Topic:Kite, Parallelogram, Rectangle, Rhombus, Square, Trapezoid

You can change the shape of these special quadrilaterals by dragging the named vertices. You can move the copies of the quadrilaterals by dragging the one named vertex on each.

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Model sferyczny - dwunastościan-dwudziestościan
Damped Trochoidal Curve
Hyperbolic Paraboloid
Random Polar Curve (3)
Viviani's Curve

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Example 3
Tabung 011
centroid
两种方法找出含有4的数字
G.3.16.3 Indirect Measurement (Mirrors)

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Coordinates
Incircle or Inscribed Circle
Arithmetic
Ratios
Set Theory