Question

the area of a square increased by what if its sides increased by 30%

Answer 1

Let side of square be "x"

=) So it's area = side × side 

= x × x = x^2 

=) new side of square = x + 30% of x 

= x + 30/100 ×x 

= x + 3x/10 

= 13x/10 

=) new area = 13x ×13x / 100 

= 169x^2/100 

increase in area = 169 x^2 /100 - x^2 

= 69 x^2/ 100 

% increase in area = 69x^2 ×100 /100x^2

= 69 % ans 

Answer 2

let all side of the square is x
then ,
area of square =a*a
= x*x * 30 /100