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At a Glance

The area of a regular pentagon looks about twice as a big as the pentangle star drawn within it. Is it?

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Darts and Kites

Explore the geometry of these dart and kite shapes!

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No Right Angle Here

Prove that the internal angle bisectors of a triangle will never be perpendicular to each other.

Pegboard Quads

Age 14 to 16 Challenge Level:

An article by Paul Andrews, "Angle Measurement: An Opportunity for Equity" , provides the best notes for background to this problem and all the Stage Three problems this month.
link to go here to ID 2855