Quadrilaterals
Expository Essay
Introductory
Paragraph
• What is a quadrilateral?
• Why is it important to understand them?
• What are some examples?
Basic Characteristics
• Four-sided polygon (four angles)
• The sum of the angles must be 360º
• The area of a quadilateral is:
A = Base x Height
Answer in square units (square centimeters)
• Perimeter is the sum of the sides
Kinds of Quadrilaterals
(Parallelogram)
• Parallelogram:
two pairs of parallel
line segments
• Rectangle: special parallelogram with
all sides perpendicular right angles (90º)
• Square: special rectangle with all
sides equal
= Base X Height
• Area
Height must be perpendicular to base
Kinds of Quadrilaterals
(Trapezoid)
• Trapezoid: only two sides are parallel
= Base (average) X Height
• Area
Height must be perpendicular to base
Kinds of Quadrilaterals
(Rhombus)
• Rhombus: all four sides are equal
• Square: special rectangular rhombus
Kinds of Quadrilaterals
(Irregular)
• Irregular: No parallel sides
Conclusion
• Write a couple of sentences
closing the essay.
Expository Essay on Quadrilaterals
1.Introductory paragraph.
2.Explain the basic characteristics
of a quadrilateral.
Sides
Angles
Area
Perimeter
3.Explain the kinds of quadrilaterals.
Parallelogram
Rectangle
Square
Trapezoid
Rhombus
Irregular
4.Conclusion.