The side of square is increased by 20%, what is the increase in perimeter?
Answer & explanation
Correct answer: option 1
a = side of square
Perimeter of a square = 4a
*The ratio between old side and new side of a square = The ratio of perimeter of old and new square*
⇒ 20% = \(\frac{1}{5}\)
old : New
Side: 5 : 6
Perimeter: 4×5 : 4×6 = 5 : 6
Therefore, perimeter also increased by 20%.