QUADRILATERALSBy Mr. Curtis Marcelle and Mrs. Kya Morris

OBJECTIVESAt 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

WHAT IS A QUADRILATERAL› A quadrilateral is a two-dimensional polygon with

four sides› Four vertices (point where the sides meet)›Four interior angles

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.

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°.

›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.

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°.

Trapezium

A trapezium has 2 opposite side that are parallel AB ∥ DC.

Kite

A kite has two pairs of equal adjacent sides.

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 all its angles are right angles AB ∥ DC, AD ∥ BC and ∠A = ∠B = ∠C = ∠D = 90°.

LETS GIVE IT A TRY…›What quadrilateral has 2 sets of parallel sides and

the sides are not ALL equal?

LETS GIVE IT A TRY…›What quadrilateral has 2 sets of parallel sides and

the sides are ALL equal?

LETS GIVE IT A TRY…›What quadrilateral has 1 set of parallel sides and

these sides are NOT equal?

ANY QUESTIONS?