GEOMETRY
PERIMETER AND AREA
, DEFINITIONS
Perimeter Area
The total length of the The amount of space
boundary of any 2D occupied by a 2D figure. In
geometric shape. other words, it is the quantity
that measures the number of
unit squares that cover the
surface of a closed figure.
, HOW TO CALCULATE PERIMETER
EXAMPLE
Josh wants to put a fence around his farm. He wants to know how much wire he would
need to fence around his farm. The shape of his farm is rectangular, which means that:
● It has four sides
● The opposite sides are of equal length
● All angles are 90 degrees each.
Let us first name the sides of his farm. The larger side of this rectangular farm is named l,
and the smaller side is named b. If we add all the distance of all four sides of his farm, it
will give us the perimeter. Total distance = l + b + l + b = 2l + 2b. Therefore, the perimeter of
a rectangle = 2(l +b) units.
PERIMETER AND AREA
, DEFINITIONS
Perimeter Area
The total length of the The amount of space
boundary of any 2D occupied by a 2D figure. In
geometric shape. other words, it is the quantity
that measures the number of
unit squares that cover the
surface of a closed figure.
, HOW TO CALCULATE PERIMETER
EXAMPLE
Josh wants to put a fence around his farm. He wants to know how much wire he would
need to fence around his farm. The shape of his farm is rectangular, which means that:
● It has four sides
● The opposite sides are of equal length
● All angles are 90 degrees each.
Let us first name the sides of his farm. The larger side of this rectangular farm is named l,
and the smaller side is named b. If we add all the distance of all four sides of his farm, it
will give us the perimeter. Total distance = l + b + l + b = 2l + 2b. Therefore, the perimeter of
a rectangle = 2(l +b) units.
