SOL Objective(s):
7.7 The student will compare and contrast the following quadrilaterals based on properties: parallelogram, rectangle, square, rhombus, and trapezoid.
Previous and Related SOL Objectives:6.13 The student will describe and identify properties of quadrilaterals.

Prerequisite Skills:

Khan Skill Phrases:
Categorize Quadrilaterals
Quadrilateral Types (Quadrilateral Angles) 
The Basics and Background Information
• A quadrilateral is a closed plane (twodimensional) figure with four sides that are line segments.
• A parallelogram is a quadrilateral whose opposite sides are parallel and opposite angles are congruent.
• A rectangle is a parallelogram with four right angles. The diagonals of a rectangle are the same length and bisect each other.
• A square is a rectangle with four congruent sides whose diagonals are perpendicular. A square is a rhombus with four right angles.
• A rhombus is a parallelogram with four congruent sides whose diagonals bisect each other and intersect at right angles.
• A trapezoid is a quadrilateral with exactly one pair of parallel sides.
• A trapezoid with congruent, nonparallel sides is called an isosceles trapezoid.
• Quadrilaterals can be sorted according to common attributes, using a variety of materials.
• A chart, graphic organizer, or Venn diagram can be made to organize quadrilaterals according to attributes such as sides and/or angles.
• A parallelogram is a quadrilateral whose opposite sides are parallel and opposite angles are congruent.
• A rectangle is a parallelogram with four right angles. The diagonals of a rectangle are the same length and bisect each other.
• A square is a rectangle with four congruent sides whose diagonals are perpendicular. A square is a rhombus with four right angles.
• A rhombus is a parallelogram with four congruent sides whose diagonals bisect each other and intersect at right angles.
• A trapezoid is a quadrilateral with exactly one pair of parallel sides.
• A trapezoid with congruent, nonparallel sides is called an isosceles trapezoid.
• Quadrilaterals can be sorted according to common attributes, using a variety of materials.
• A chart, graphic organizer, or Venn diagram can be made to organize quadrilaterals according to attributes such as sides and/or angles.
Essential Knowledge and Skills
The student will use problem solving, mathematical communication, mathematical reasoning, connections, and representations to...
• Compare and contrast attributes of the following quadrilaterals: parallelogram, rectangle, square, rhombus, and trapezoid.
• Identify the classification(s) to which a quadrilateral belongs, using deductive reasoning and inference.
• Compare and contrast attributes of the following quadrilaterals: parallelogram, rectangle, square, rhombus, and trapezoid.
• Identify the classification(s) to which a quadrilateral belongs, using deductive reasoning and inference.
Vocabulary and Things to Know:

Be Able To:compare quadrilaterals
identifiy quadrilaterals classify quadrilaterals 
The topic: What is it and what will we learn?
There are several "kinds" of quadrilaterals. They are classified just as many things are grouped, according to similar attributes (trait, characteristic, properties, etc.). So a square is different than a rectangle, but a square is a kind of rectangle, a parallelogram, a quadrilateral, a polygon, and a plane figure.
Math.com: QuadrilateralsInformation, Venn diagram, and interactive practice.

Math is Fun: QuadrilateralsInformation, diagrams, and interactive practice.

Math Warehouse:

Quadrilateral OverviewAdditional vocabulary is used, but Khan Academy explains them all.


Center for Distance and Online LearningInteractive way to practice quadrilateral properties.

Mathx.net: Quadrilateral WorksheetsScroll down to find several worksheet options at different levels to practice identifying figures, as well as solving problems. Scroll all the way to the bottom and take the knowledge test (an online game). :)
