The area of the rectangle is 40 cm. The length of one side of it is 8 cm. Find the perimeter of this rectangle.
July 29, 2021 | education|
From the condition, we know the area of the rectangle is 40 cm2, as well as the length of one of its sides is 8 cm.
In order to find the perimeter of a rectangle, we need to know the lengths of its sides.
We know the area of the rectangle, which can be found by the formula S = a * b, from here we will find the unknown side.
Substitute and calculate:
40 = 8a;
a = 40: 8;
a = 5 cm length of the second side of the rectangle.
Let’s recall the formula for finding the perimeter of a rectangle and calculate it.
P = 2 (a + b) = 2 (5 + 8) = 2 * 13 = 26 cm rectangle.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.