Correct Answer - Option 4 : 20 cm
Given:
The side of the square is increased by 10 cm
Concept Used:
Area of square = Side × Side
Calculation:
Let side of Square is X cm
Now area of Square is X2
If side is increased by 10cm then new area is 500 cm2 more than old area.
we get that,
⇒ (X + 10)2 = X2 + 500
⇒ X2 + 100 + 20X = X2 + 500
⇒ 20X = 400
⇒ X = 20
∴ The required side of the square is 20cm