A(x₁, y₁):
B(x₂, y₂):
C(x₃, y₃):
D(x₄, y₄):
Draw AB
Draw CD
Convert CD to DC
C → C′
D → D′
Translate DC → D′C′
Draw C′E
Draw BE
Draw AE
Label C′
Label E
Label AB
Label CD
Label DC
Label C′E
Label BE
Label AE
Label CC′
Label DD′
Label AC′
Reset