Boing Boing on MSNOpinion
Two twisty doughnut shapes solve a 150-year-old geometry puzzle
In 1867, French mathematician Pierre Ossian Bonnet proved something that seemed like common sense: if you know how far apart ...
Revise the different types of angles and rules for calculating angles. This guide includes interactive activities and a quiz. NEW: Angles in parallel lines Revise alternate, correspondent or ...
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