- Books Name
- class 7 Mathematics Book
- CBSE Class 7
Perimeter and Area
Introduction to square
A square is a flat shape with 4 equal sides and every angle is a right angle i.e. 90°.
Special case of square
In the above figure, ABCD is a square.
Here AB = BC = CD = DA
Each interior angle is 90°.
The Perimeter of square is 4 times the side length. Let a be the length of each side of square.
Now, perimeter of square = 4 * a = 4a
Area of square = side length squared
= a * a
Square area, perimeter & diagonal
Area and Perimeter of Square
Square is a quadrilateral, with four equal sides.
Area = Side × Side
Perimeter = 4 × Side
Find the area and perimeter of a square-shaped cardboard whose length is 5 cm
Area of square = (side)2
= 25 cm2
Perimeter of square = 4 × side
= 4 × 5
= 20 cm
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