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Getting an Angle
Age 11 to 14
Challenge Level 
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Arclets Explained
This article gives an wonderful insight into students working on the Arclets problem that first appeared in the Sept 2002 edition of the NRICH website.
Bow Tie
Show how this pentagonal tile can be used to tile the plane and describe the transformations which map this pentagon to its images in the tiling.
Convex Polygons
Show that among the interior angles of a convex polygon there cannot be more than three acute angles.