Identify the sides and find perimeter of a quadrilateral
4th Maths : Term 1 Unit 1 : Geometry
Perimeter
The perimeter is the sum of all sides of a closed figure.
EXAMPLES
Finding the sides and perimeter of the following figures.
Sides = AB, BC, CD, DA
Perimeter = AB + BC + CD + DA
\[ = 3 + 6 + 8 + 2 = 19 \]
Perimeter = \(19\text{cm}\)
In a given square all the sides are equal.
Therefore, Perimeter of a square = PQ + QS + SR + RP
\[ = 8 + 8 + 8 + 8 = 32 \]
Perimeter of a square = \(32\text{cm}\)
In a given rectangle opposite sides are equal.
Perimeter = LM + MN + NO + OP
\[ = 9 + 3 + 9 + 3 = 24 \]
Perimeter = \(24\text{cm}\)
Perimeter = XY + YZ + ZX
\[ = 7 + 7 + 7 = 21 \]
Perimeter = \(21\text{cm}\)
Activity:
Find the Perimeter of Table, Desk, Black board and Door in your class room.