CLASS-8
PERIMETER & AREA OF SQUARE

The perimeter (P) of a square PQRS. 

=  PQ + QR + RS + PS

=   4 PQ   [ all the sides are equal ]

=   4 X length of any side

Perimeter (P) = 4 X length of any one side (a)

  P = 4a,  or   a = P/4 

Are of a Square –

If the area of any square is –

If the area of a square be A and the length of its side be a then,

 A = a²,

or  a = √A