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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