2 DefinitionA quadrilateral is a closed geometric figure with four sides, four vertices, and four angles.The segments of a quadrilateral intersect only at their endpoints.QuadrilateralsNot QuadrilateralsNon consecutive sides should not intersectMore than 4 sidesMust only contain Segments3 sides
3 Naming Quadrilaterals Quadrilaterals are named by listing their vertices in order. There are many names for the quadrilateral below. Some examples are quadrilateral ABCD, quadrilateral BCDA, or quadrilateral DCBA.
4 SidesAny two sides, vertices, or angles of a quadrilateral are either consecutive or nonconsecutive.In a quadrilateral, nonconsecutive sides, vertices, or angles are also called opposite sides, vertices, or angles.
5 DiagonalsSegments that join nonconsecutive vertices of a quadrilateral are called diagonals.
6 PropertiesThe sum of all the angles equals 360º degrees.110º70º360º90º360º90º360º90º360º65º115º360º
7 Special Quadrilaterals A quadrilateral is a four-sided polygon, but some of them have characteristics that make them special.We will be covering 6 special quadrilaterals:ParallelogramRectangleSquareRhombusKiteIsosceles Trapezoid
8 Six Special Quadrilaterals ParallelogramRectangleIsoscelesTrapezoidRhombusSquareKite
9 Special Quadrilateral Properties Each special quadrilateral has its on properties. However there are similarities between them.Your task is going to be to discover their properties by constructing and exploring each one.