square - A parallelogram with four equal sides and four right angles, rectangle - A parallelogram with opposite equal sides and four right angles, rhombus - A parallelogram with four equal sides and opposite angles that are equal., parallelogram - A quadrilateral that has two sets of parallel sides., trapezoid - A quadrilateral with one set of parallel sides., polygon - A closed figure with at least three straight sides., pentagon - A polygon with exactly 5 sides and 5 vertices., hexagon - A polygon with exactly 6 sides and 6 vertices., Equilateral Triangle - A triangle with all equal sides., Isosceles Triangle - A triangle with at least two equal sides., Scalene Triangle - A triangle with no equal sides., Acute Triangle - A triangle in which all angles are less than 90 degrees., Right Triangle - A triangle with one 90° angle., Obtuse Triangle - A triangle with one angle which is greater than 90 degrees. ,

Two-Dimensional Figures

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