Rectangle area 56 square mm, length 7 mm, find the perimeter of the premonitor.

In order to find the perimeter of a rectangle, we first need to know the length and width of the rectangle.
The length of 7 mm is known to us from the condition, and we also know that the area of the rectangle is 56 mm2.
To find the width of the rectangle, we will use the formula for finding the area of the rectangle.
S = a * b;
Let us express the width from the formula:
a = S / b;
a = 56/7 = 8 mm rectangle width. We are looking for the perimeter using the following formula:
P = 2 (a + b) = 2 (7 + 8) = 2 * 15 = 30mm perimeter of the rectangle.
Answer: 30mm perimeter.