Convex quadrilaterals
Paulo Correia
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Gauss-Jordan 2x2 Elimination
Auston B Cron
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A Dozen Rolling Triangles
Steve Phelps
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Nine Rotating Squares
Steve Phelps
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Five Rolling Triangles
Steve Phelps
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Wave Pulse Addition Practice
Tom Walsh
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Angle Estimation Warmup
Andrew Knauft
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Area Models for Improper Fractions – 2 Fractions
EDC in Maine
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Multiplication Quiz
Lee W Fisher
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Planar Graphs
Franz Rittenschober
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