Geometry section of

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* calculator link
Polygons (regular, convex, types)
Angles and Polygons (interior, exterior, formulas, why they work)
Areas of Regular Polygons (formula and derivation)
Area and Circumference of Circles (derivations of formulas)


REFRESHERS: (while these topics are mostly "review", you may also find new information here)
Area and Perimeter of Familiar Polygons (triangles, quadrilaterals, derivations of formulas)
Practice with Area & Perimeter (of familiar polygons)