

Types of quadrilaterals
Rectangle
A rectangle is a quadrilateral where all four angles are 90 degrees. A square is a special type of rectangle where all four sides are the same length.
Rectangle 
Square 
Parallelogram
A parallelogram is when both opposing 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 only one pair of opposing parallel sides (see the picture below). An isosceles trapezoid is a trapezoid where the nonparallel sides are of equal length and it has a line of symmetry down the middle.
More Geometry Subjects
Circle
Polygons
Quadrilaterals
Triangles
Pythagorean Theorem
Perimeter
Slope
Surface Area
Volume of a Box or Cube
Volume and Surface Area of a Sphere
Volume and Surface Area of a Cylinder
Volume and Surface Area of a Cone
Angles glossary
Figures and Shapes glossary
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