What is a
QUADRILATERAL?
Quadrilateral
4
Please teach
your partner
what
quadrilateral
means.
SIDE
Quadrilaterals
Which of these shapes would be
called “quadrilaterals”?
square
rectangle
rhombus
trapezoid
parallelogram
In this slide show you will
learn that we identify
quadrilaterals by:
their angles
and the length of
their sides.
Square


A square has four sides that are each
the same length.
It also has four right angles (perfect
corners).
1
2
4
3
Please teach your partner why it is a square
Rhombus


A rhombus has four sides that are
each the same length.
But it has two acute and two obtuse
angles.
(> than a right angle) obtuse
acute
acute (< than a
obtuse
right angle)
Square and
Rhombus

A square and a rhombus both have
four sides that are the same length.
So, how are they different?
Square and
Rhombus


A rhombus can be thought of as
a slanted square.
If we push on the left-hand side
of this square, it might end up
looking like…
a rhombus.
The only difference
between a square and a
rhombus is…
their angles!
Please teach your partner the difference between a square and a
rhombus and how they are the same & different using math
vocabulary & names.
Trapezoid



A trapezoid has four sides. They are
all different lengths.
Two sides are parallel.
The opposing two sides are not
parallel.
Those are
parallel.
Please teach your partner what a trapezoid is…
Those are
not parallel.
Rectangle
•A rectangle has four
sides – two long sides and
two short sides.
•Two sides are parallel.
•The opposing two sides
are also parallel.
•It also has four right
angles.
Teach your partner the
Difference between a
rectangle and a rhombus.
Parallelogram
•A parallelogram has four
sides – two long sides and
two short sides.
•Two sides are parallel.
•The opposing two sides
are also parallel.
•But, it has two acute and
two obtuse angles.
Rectangle and
Parallelogram


A parallelogram can be thought of as
a slanted rectangle.
If we push on the left-hand side of
this rectangle, it might end up
looking like…
Please teach your partner
the difference between a
rectangle and a
parallelogram.
a parallelogram.
The only difference
between a rectangle and
a parallelogram
is their angles.
Use the following table to
make comparisons using the
quadrilaterals.
SHAPE
Quadrilaterals
SIDES
ANGLES
Square
4 same
length
4 right
angles
Rhombus
4 same
length
2 acute
2 obtuse
Different
lengths
Different
angles
Trapezoid
Rectangle
Parallelogram
2 long,
2 short
2 long,
2 short
4 right
angles
2 acute
2 obtuse
PARALLEL
LINES
2 sets
2 sets
1 set
2 sets
2 sets
Write in your journals:



What is the difference between a
square and a rhombus?
What is the difference between a
rectangle and a parallelogram?
Why is a trapezoid a quadrilateral
but NOT a parallelogram?