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- Algebra 1 Trailer
- scenario-base
- Each exterior angle of a triangle is equal to the sum of the two interior opposite angles.
- Images . Polyhedron(V=120) from Biscribed Pentakis Dodecahedron for the case of trisection of its 6th-order segments
- warm up "A sphere in a cylinder'
- Two Triangles & One Congruent Side.