Types of quadrilaterals Rectangle A rectangle is a quadrilateral where all four angles are 90 degrees. A square is a type of rectangle where all four sides are the same length.
Parallelogram A parallelogram is when two pairs of sides on a quadrilateral are parallel. Squares and rectangles are also parallelograms. 
Rhombus A rhombus is a quadrilateral where all four sides have the same length. A square is a rhombus but not all rhombuses are squares. 
Trapezoid A trapezoid is when there is one pair of parallel sides. An isosceles trapezoid is a trapezoid where the non-parallel sides are of equal length and it has a line of symmetry down the middle (see the picture). 
Advanced Kids Math Subjects Statistics Mean, Median, Mode, and Range Picture Graphs Algebra Order of Operations Exponents Ratios Ratios, Fractions, and Percentages Geometry Polygons Quadrilaterals Triangles Pythagorean Theorem Circle Perimeter Surface Area Misc Prime Numbers Roman Numerals Back to Kids Math Back to Kids Study |
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