There are two squares, the area of the first is 81 square meters, and the side length of the second is 11 times of the first

There are two squares, the area of the first is 81 square meters, and the side length of the second is 11 times of the first

The first side is 9
（9*11）^2==99^2

Find the side length of a square with an area of 81 square meters

9*9=81
The side length of a square is 9 meters

When the side length of a square increases by 3 meters, the area increases by 81 square meters. What is the area of the original square?

(81-3 × 3) △ 3 △ 2, = (81-9) △ 3 △ 2, = 72 △ 3 △ 2, = 12 (meters), 12 × 12 = 144 (square meters). Answer: the original square area is 144 square meters