Alexander Bogomolny
M,N,P,Q are the midpoints of the arcs AB,BC,CD, & AD. Prove MN=PQ & MN⊥PQ http://www.cut-the-knot.org/m/Geometry/FourSemicircles.shtml … pic.twitter.com/tp0K0N7xW1
Matt Enlow
@CutTheKnotMath This is a case of van Aubel's theorem with a degenerate quadrilateral, no?
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@CmonMattTHINK Quite so. But very easy to prove directly.
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