If the side of a square increases by 30% its area increases by:
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Answer:
69%
Step-by-step explanation:
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
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