Area and Perimeter
- The perimeter is defined as the total boundary length of the particular shape.
- Let us learn how to find the perimeter of rectangles and squares.
- A rectangle has two dimensions namely length and breadth.
- The formula to calculate the perimeter of the rectangle is
Perimeter = 2 Length + 2 Breadth
- The unit of the perimeter is linear.
Find the area of the rectangle with a length of 22 cm and a breadth of 13 cm.
Length of the rectangle = 22 cm
Breadth of the rectangle = 13 cm
Perimeter of the rectangle = 2 × 22 cm + 2 × 13 cm
= 44 cm + 26 cm
= 70 cm
- All sides of the square are equal in length.
- The formula to calculate the perimeter of the square is Perimeter = 4 × Side
Find the perimeter of a square with a side of 19 cm.
Side of the square = 19 cm
The perimeter of the square = 4 × 19 cm
= 76 cm
Unit of Perimeter
- Perimeter is the sum of the boundary length of the shape.
- When the perimeter of the rectangle is calculated then it has to be made sure that the unit of the length and breadth are the same.
- When we add two same linear units, we get the linear unit.
- Therefore, the perimeter is always measured in the linear unit.
- For example, the perimeter of the rectangle with length and breadth of 15 m and 12 m is 54 m.
Perimeter of Polygon
Find the perimeter of the given figure.
Perimeter = (5 + 2 + 2 + 2 + 4 + 2 + 6 + 9) cm
= 32 cm
If the perimeter of the given figure is equal to 21 cm, then calculate the missing sides.
Sum of the given sides = (4 + 6 + 2) cm
= 12 cm
Perimeter = 21 cm
Missing Length = 21 cm – 12 cm
= 9 cm
The perimeter of a circle is called the circumference.
Did you know?