[ª]
,
[©]
,
[^]
,
[¨]
Perpendiculars from four corners to diagonals / In the case of parallelogram
(GC World : Various Problems ,Quadrangle¨Quadrangle)
What feature do you see when ABCD is a parallelogram?
GC/Win
Forum of Geometric Constructor
by
Y.Iijima