If you are refering to a rectangle or paralellogram the the area will be 3 times.
L x W = A
3L x W = 3A
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To double the area of a square, you must multiply the length of the sides by the square root of 2, √2, which is about 1.414.
If a square has a side length of 4 centimetres, then its area is equal to 4 x 4 = 16cm2 (16 square centimetres).If a square has a side length of 8 centimetres, then its area is equal to 8 x 8 = 64cm2 (64 square centimetres).Therefore, by doubling the side length of a square, the squares area quadruples.
The area of an octagon that has a side length of 2.45m is about 29m2
The area of a square is (the side length)2.That means (the side length) times (the side length).If you multiply 15 by 15, that will get you close.
Length of Side*Length of Side (in square units).