diff --git a/exercise10.txt b/exercise10.txt
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+Segment f: Segment A,B
+Line g: Line through B perpendicular to f
+Point C: Point on g
+Point C': C mirrored at f
+Segment h: Segment A,C
+Point D: Midpoint of h
+Segment i: Segment C',D
+Point E: Intersection of f and i
+Point B': B mirrored at E
+
+Points in de segment: A, B', E and B.
\ No newline at end of file