Speilinger

A triangle ABC is reflected in the white mirror line to give the triangle A'B'C'. Lines connecting A to A', B to B' and C to C' are also shown.

Move some points about.

Please enable Java for an interactive construction (with Cinderella).
a0 a1 a2 a3 a4
b0 b1 b2 b3 b4
c0 c1 c2 c3 c4
d0 d1 d2 d3 du er her
e0 e1 e2 e3 e4
f0 f1 f2 f3 f4
g0 g1 g2 g3 g4

What TWO things are always true about the points M, N and P?

            Result:

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