Polygon - A closed 2D shape with straight sides, Quadrilateral - A polygon with 4 sides, 4 angles and 4 vertices, Angles - The space between two intersecting lines, measured in degrees, Vertices - The point where two or more lines meet - also known as a corner, An equilateral triangle - A triangle where all of the sides and angles are equal, An isosceles triangle - A triangle where two of the sides and two of the angles are equal, A scalene triangle - A triangle where none of the sides or angles are equal, A parallelogram - A quadrilateral where both pairs of opposite sides are parallel, A rhombus - A quadrilateral with four equal sides, equal opposite angles and no right angles, A trapezium - A quadrilateral in which one pair of opposite sides are parallel, A heptagon - A polygon with 7 sides, 7 angles and 7 vertices, A nonagon - A polygon with 9 sides, 9 angles and 9 vertices, A decagon - A polygon with 10 sides, 10 angles and 10 vertices,

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