Speilinger

A' is the reflection of A in the line y=x and B' is the reflection of B in the line y=-x.

A has co-ordinates (3,5). What are the coordinates of A'?

Move A to other positions.

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 du er her d2 d3 d4
e0 e1 e2 e3 e4
f0 f1 f2 f3 f4
g0 g1 g2 g3 g4

What is the connection between the coordinates of A and A'?

Result:

B is at (1,3). What are the coordinates of B'? Move B. What is the connection between the coordinates of B and B'?
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