Find the area of a rectangle, one side of which is 18cm, and the other is 4 times longer than the first.

A rectangle in geometry is a quadrilateral in which each corner is right, and the opposite sides are equal in pairs.

The opposite sides of the rectangle are trampled parallel and equal.

We know the length of one side is 18 cm, and we also know that the second side is 4 times longer than the first.

To find the length of the second side, we must multiply the length of the first side by 4. So, we are looking for the length of the second side:

18 cm * 4 = 72 cm length of the second side of the rectangle.

Let’s recall the formula for finding the area of ​​a rectangle and calculate the area of ​​a given rectangle
Now that we know the lengths of the sides of the required rectangle, we recall the formula for finding the area of ​​a rectangle.

S = a * b, where a and b are the lengths of the sides of the rectangle.

The area of ​​a rectangle is equal to the product of the lengths of its sides.

We just have to substitute the found values ​​of the lengths of the sides into the formula and perform the calculations.

So, we substitute and perform the multiplication:

S = 18 * 72 = 1 296 cm2.

Answer: 1 296 cm2 is the area of ​​a given rectangle.