Quadrilateral - a four-sided figure, Rhombus - a quadrilateral with four equal sides, Parallelogram - a quadrilateral with 2 pairs of parallel sides, Trapezoid - a quadrilateral with 1 pair of parallel sides, Square - a quadrilateral with 2 pairs of parallel sides, 4 right angles and 4 equal sides, Rectangle - a quadrilateral with 2 pairs of parallel sides and 4 right angles, Equilateral Triangle - a triangle with all equal sides, Isosceles Triangle - a triangle with 2 equal sides, Scalene Triangle - a triangle with no equal sides, Right Triangle - a triangle with 2 acute angles and one right angle, Obtuse Triangle - a triangle with 2 acute angles and one obtuse angle, Acute Triangle - a triangle with all acute angles,

Classifying Triangles and Quadrilaterals

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