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Quadrangle→Quadrangle

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4p4p00 The Concept of "Quadrangle→Quadrangle"
4p4p01 Connecting the midpoints of four sides
Exploring correspondence


In the condition of particular shape


In the condition of particular shape


In the condition of particular shape

4p4p02 Bisectors of four corners
Exploring correspondence


In the condition of particular shape


Always parallelogram

4p4p03 Perpendicular bisectors of four sides
Exploring correspondence


In the condition of particular shape


Always parallelogram


The result is one point


The result is one point/Sets of corresponding points

4p4p04 Perpendiculars from four corners to diagonals
In the case of rectangle


In the case of parallelogram


In the case of square


In the case of general quadrangle

Forum of Gemetric Constructor by Y.Iijima