Polygon - a shape composed of line segments, called sides, that are joined together, Regular Polygon - a shape with all of its sides equal and all of its angles equal, Vertex - where two sides of the polygon meet, Right Angle - 90 degrees, Perpendicular Lines - Two lines that form a right angle, Base - A horizontal side of a triangle, Height - perpendicular distance from the vertex of a triangle to the base, Equilateral Triangle - triangle with all sides equal, Isosceles Triangle - triangle with only two equal sides, Scalene Triangle - triangle with no equal sides,

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