The length of the rectangle. 12cm, and the width is 4cm less. Find the area.

| February 5, 2021 | education

The length of the rectangle. 12cm, and the width is 4cm less. Find the area and the perimeter of the rectangle. Find the area of a square with the same perimeter.

First, find out the value of the width:

1) 12 – 4 = 8 (cm) width of the rectangle.

To find the perimeter of a rectangle, you need to use the formula P = 2 (a + b). Substitute the known values:

2) 2 (12 + 8) = 2 * 20 = 40 (cm) perimeter of the rectangle.

Now we find the area by the formula S = a * b. Substitute the known values:

3) 12 * 8 = 96 (cm²) area of ​​the rectangle.

Now you need to know that the perimeter of the square is calculated by the formula P = 4 * a. Substitute the known values:

4) 4 * x = 40

5) 40: 4 = 10 (cm) one side of the square.

To calculate the area of ​​a square, you need to square the side by multiplying by itself:

6) 10 * 10 = 100 (cm²).



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