angle, parallel sides, parallelogram, polygon, quadrilateral, rectangle - 4 sides, 4 right angles, opposite sides are parallel and equal, rhombus, right angle - represented by a square in the corner, 90 degrees, side - the flat surfaces that make up a shape, square - a shape with four equal sides and four corners, and each corner is a right angle, trapezoid, vertex - a sharp point or corner where two or more lines meet to form a shape,

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