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- Math Topics Project 1
- SecondegreR1
- multiple0_28
- Richmond's classical construction of the 17-gon
- An excircle of a triangle is externally tangent to a side of the triangle and tangent to the extensions of the other two sides. Each triangle has three excircles.
- Parallelogram Ponder
- GM3-05-P1-Q2 Plot the Reflection