WOLFRAM

DEMONSTRATIONS
PROJECT
Quadrilateral Slide
x
coordinate
of
C
position
of
E
on
BG
position
of
H
on
JG
show
text
half
turn
translate
A
A
C
B
E
F
G
H
E
I
J
D
A quadrilateral slide (or Qslide) transforms one quadrilateral to another with the same angles. The notion was introduced by Harry Lindgren (1956).