polygon - A closed figure in a plane formed by three or more line segments., triangle - A polygon with exactly three sides, quadrilateral - A polygon with four sides, parallelogram - A quadrilateral with both pairs of opposite sides parallel and congruent, trapezoid - A quadrilateral with exactly one pair of parallel opposite sides, square - A parallelogram with four congruent sides and four right angles., perimeter - Distance around a flat shape, circumference - The distance around a circle, center - A point inside a circle that is equidistant from each point on the circle, diameter - The distance across the circle through the center, radius - The distance from the center to any point on the circle, pi - The ratio of the circumference to the diameter, represented by the Greek letter,
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Two- Dimensional Geometry
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Aswallow
G6
G7
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