Congruent - same size and same shape, Right angle - angle formed by perpendicular lines), Acute angle - angle that measures less than 90°, Obtuse angle - measures greater than 90°, Polygon - closed figure with at least 3 straightsides, Quadrilateral - 4 sides 4 vertices, Parallelogram - 2 pairs of parallel sides opposite sides congruent, Rectangle - 4 sides, a right angles, opposite sides congruent, Rhombus - 4 sides, 4 vertices, 2 pair parallel sides, all sides congruent, Square - a special type of rectangle and a special type of rhombus,

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