j/k = m/n  ja que els triangles son semblants ...

Exercici 21 llibre 4ESO

A = (0, 0)
B = (14, 0)
a = Line(A, B)
C = (14, 7)
b = Line(B, C)
D = Point(a)
c = Line(A, D)
E = (-5, 3)
d = Line(D, E)
e = Line(E, A)
F = (0, 8)
f = Line(A, F)
G = Mirror(D, A)
H = Mirror(E, A)
I = Mirror(E, f)
g = Line(A, I)
J = Intersect(g, b)
h = Line(E, A)
i = Segment(A, E)
j = Segment(E, D)
k = Segment(D, A)
n = Segment(A, B)
m = Segment(B, J)