Amar drew a square. He then erased it and drew a second square whose sides were 3 times the sides of the first square. By what percent was the area of the square increased?
Answer: 800%
Explanation
Let side of the square = a
Area = a 2
∴ new side = 3a
Hence, new area = (3a)
2 =9a 2 Precentage increase in area =
a 2 9a 2−a 2 ×100=800%
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