Quadrilaterals

Definition

• Quadrilateral – a polygon with 4 angles and 4 straight sides.

Types of Quadrilaterals

• Square: Quadrilateral with four equal sides and four right angles (90 degrees)

Indicates equal sides

Box indicates 900 angle

Types of Quadrilaterals

• Rectangle: Quadrilateral with two pairs of equal sides and four right angles (90 degrees)

Indicates equal sides

Box indicates 900 angle

Types of Quadrilaterals

• Parallelogram: Quadrilateral with opposite sides that are parallel and of equal length and opposite angles are equal

Indicates equal sides

Types of Quadrilaterals

• Rhombus: Parallelogram with four equal sides and opposite angles equal

Indicates equal sides

Types of Quadrilaterals

• Trapezoid: Quadrilateral with one pair of parallel sides

Parallel sides never meet.

Types of Quadrilaterals

• Kite: 2 pairs of adjacent sides equal.

One pair of opposite angles equal.

Name the Quadrilaterals

12 3

4 5 6

rectangle irregular rhombus

parallelogram trapezoid square

Interior Angles

• Interior angles: An interior angle (or internal angle) is an angle formed by two sides of a simple polygon that share an endpoint

• Interior angles of a quadrilateral always equal 360 degrees

Quadrilateral Family

parallelogram

rectangle

rhombus square

trapezoid

Property of quadrilaterals

• The sum of all the angles equals 360º degrees.

90º

90º

90º

90º

http://teams.lacoe.edu/documentation/classrooms/amy/geometry/6-8/activities/quad_quest/quad_quest.html