This document defines and describes different types of quadrilaterals: - A quadrilateral is a 2D polygon with four sides and four vertices. - There are both regular and irregular quadrilaterals. A regular quadrilateral has four equal sides and four equal interior angles, while an irregular quadrilateral has unequal sides and/or interior angles. - Specific types of quadrilaterals discussed include squares, rectangles, parallelograms, trapezoids, and kites. Each has distinct properties regarding their sides and angles. The document provides examples to help differentiate between the different quadrilateral types.

1. QUADRILATERALS
By Mr. Curtis Marcelle and Mrs. Kya Morris

2. OBJECTIVES
At the end of this lesson, students will be able to:
› Define the term quadrilateral
› State the different types of quadrilaterals
› Differentiate between the different types of quadrilaterals
› Apply basic construction techniques to construct at least two types
of quadrilaterals
› Demonstrate the correct techniques for constructing at least two
types of quadrilaterals
› Value the use of quadrilaterals

3. WHAT IS A QUADRILATERAL
› A quadrilateral is a two-dimensional polygon with
four sides
› Four vertices (point where the sides meet)
› Four interior angles

4. TYPES OF QUADRILATERALS
(REGULAR & IRREGULAR)
› A regular quadrilateral is a two-dimensional
polygon whose sides are all the same length, and
whose interior angles are all the same.

5. A square is an example of a regular quadrilateral
Square
A square has 4 equal sides and all its angles are right angles.
AB ∥ DC, AD ∥ BC, AB = BC = CD = DA and ∠A = ∠B = ∠ C = ∠D = 90°.

6. › An irregular quadrilateral is a two-dimensional
polygon whose sides are not the same length, and
whose interior angles are different in size.
Parallelogram
Both pairs of its opposite sides are parallel and equal.
AB ∥ DC and AD ∥ BC.

8. Rectangle
A rectangle has its opposite sides equal, and all its angles are right angles
AB ∥ DC, AD ∥ BC and ∠A = ∠B = ∠C = ∠D = 90°.

9. Trapezium
A trapezium has 2 opposite side that are parallel
AB ∥ DC.
Kite
A kite has two pairs of equal adjacent sides.

10. LETS GIVE IT A TRY…
› What quadrilateral has 4 right angles and the sides
are not ALL equal?
Rectangle
A rectangle has its opposite sides equal, and

11. LETS GIVE IT A TRY…
› What quadrilateral has 2 sets of parallel sides and
the sides are not ALL equal?

12. LETS GIVE IT A TRY…
› What quadrilateral has 2 sets of parallel sides and
the sides are ALL equal?

13. LETS GIVE IT A TRY…
› What quadrilateral has 1 set of parallel sides and
these sides are NOT equal?

14. ANY QUESTIONS?