The rectangle is 3 cm wide and 3 times longer. calculated the area of this rectangle.

By condition, it is necessary to find the area of ​​the rectangle.

The area of ​​a rectangle is found as the product of its length and width, that is, according to the formula:

S = a * b,

where S is the area of ​​the rectangle, a is the length of the rectangle, and b is the width of the rectangle.

By condition, the width of the rectangle is 3 cm, and the length is 3 times greater.

If one quantity is n times greater or less than another quantity, then this quantity is equal to the product of another quantity and the number n, then the length of the rectangle is:

a = 3 * b = 3 * 3 = 9 (cm).

Let’s find the area of ​​the rectangle by substituting the data according to the condition and the found values:

S = 9 * 3 = 27 (cm ^ 2).

Answer: the area of ​​the rectangle is 27 cm ^ 2.