Khan Academy Static

Not all things with four sides and 90 degree angles are squares or rectangles! Sometimes the angles in these 4-sided shapes are less than (or greater than) 90 degrees, causing them to have a slightly odd shape. These are called quadrilaterals and come in a few different varieties. In this tutorial, you'll learn about them.

3767_Classifying_quadrilaterals.html

3768_Kites_as_a_geometric_shape.html

3766_Quadrilateral_types.html

3765_Quadrilateral_properties.html

3764_Intro_to_quadrilateral.html