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|Tony Davie; School of Mathematical and Computational Sciences, Univ. of St Andrews, Scotland|
|A brief illustrated page about a seemingly simple problem involving an isosceles triangle with some angles given. Under what circumstances are all the angles in the diagram rational multiples of pi? Further discussion of adventitious quadrangles and concurrent diagonals ensues.|
|Levels:||High School (9-12), College|
|Resource Types:||Lesson Plans and Activities|
|Math Topics:||Euclidean Plane Geometry, Trigonometry|
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