DAY 106 – INTRODUCTION TO
QUADRILATERALS
INTRODUCTION
Figure out these, most of our houses or rooms in
our houses are designed in a figure with 4 sides,
other things such as screens, laptops, windows,
doors, game pitches, writing papers among others,
have four corners and four sides. I hope this could
be one of most utilized geometric figure in the
world. Therefore, it worthy knowing what they are
and the forms that they take.
In this lessons, we are going to define and identify
quadrilaterals
VOCABULARY
Quadrilaterals
These are 4 sided figures. The sum of interior
angles of a quadrilaterals 180°.
Rectangle
This is a four sided figure where opposite sides are
equal and parallel. All interior angles are equal to
90°.
Square
This is a four sided figure where opposite sides
parallel and all sides are equal. All interior angles
are equal to 90°. Due to these features, it is also
called a regular quadrilateral.
Rectangle
Square
Parallelogram
This is a four sided figure where opposite sides are
equal and parallel. The opposite angles are equal
and adjacent angles add up to 180°
Rhombus
This is a four sided figure where opposite sides are
parallel and all sides are equal. The opposite angles
are equal and adjacent angles add up to 180°. Its
diagonals are perpendicular.
Parallelogram
Rhombus
Trapezoid
This is a four sided figure where two sides are
parallel.
Kite
It is a four sided figure where the diagonals are not
equal but perpendicular to each other.
Example
Identify the quadrilateral where the diagonals are
perpendicular.
Solution
By the properties of the quadrilateral, we find that,
the rhombus and the kite are the only figures
satisfying the above conditions.
HOMEWORK
Identify the following figures
(i)
(iii)
(ii)
ANSWERS TO HOMEWORK
Trapezoid (i) and (ii)
Rectangle (iii)
THE END