triangle, a figure with three sides and three angles, equilateral, sides are equal in length, isosceles triangle, a triangle in which at least 2 sides are of equal length, and opposite angles are equal, scalene triangle, a triangle in which all sides have a different length, right triangle, a triangle with one right angle, acute triangle, a triangle with three acute angles, obtuse triangle, a triangle with one obtuse angle, trapezoid, a quadrilateral with only one pair of parallel sides, parallelogram, a quadrilateral with two pairs of parallel sides, rhombus, any parallelogram with equal sides, including a square, rectangle, a figure with four straight sides and four right angles, square, a quadrilateral with four right angles and four equal sides, parallel, two or more lines that are always the same distance apart and never intersect, opposite, having a position on the other or furthest side of something, vertex, each angular point of a polygon or other figure, quadrilateral, a shape with four sides, four vertices and four angles.

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