If you are multiplying the sides of any quadrilateral with a number, the area would be multiplied with the square of that number. So if you are multiplying the rectangle's sides with 2.5, the area should be multiplied by 2.5^2 that is 6.25.
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area of the rectangle..
If the length and width of a rectangle are multiplied by the same number, then . . . -- the perimeter is multiplied by the same number -- the area is multiplied by the square of the numbner
Area is multiplied by 16. Perimeter is multiplied by 4.
The area of a rectangle is always length multiplied by width. Therefore, the area of the mentioned rectangle is 36cm2.
Area of any rectangle in square units is its length multiplied by its width.