Mathematics is a rather complicated science. That is why some students may have difficulty understanding some topics. This article is written to help parents explain material that is difficult for a child. So, the article will talk about how to find the area and perimeter of a rectangle.
How to find the perimeter of a rectangle?
What is a perimeter? These are the lengths of all sides, folded together. How to find the perimeter? To find it, you need to add the lengths of all sides. But it is long and inconvenient. That is why they invented a new formula. The fact is that the parties lying opposite each other are equal. So you can take two lengths and two widths of the rectangle and fold them. And so a new formula was born. The perimeter in it is denoted by the letter P. So, P = 2 * (a + b), where a is the length of the rectangle, b is its width. To test yourself, solve the following problem: length 6 centimeters, width 4. Find the perimeter of the rectangle. If you understand the topic and correctly solve the problem, then you will get 20 cm.
Another such situation may arise: one side and the perimeter are given, it is necessary to find the second side of the rectangle. This task can be solved in two ways. First: P = 2a + 2b, hence b = (P-2a): 2. The second option: P = 2 * (a + b), therefore b = P: 2-a. That's all. All material on the topic is given. Nothing complicated, right?
Rectangle area
And what is the area? In simple terms, an area is the number of units of measure inside a rectangle (or any other shape). Denote the area by the letter S. Then S = a * b, where a is the length, b is the width of the rectangle.
But what if the area and one of the sides are known? We’ll find out now. What is the area? That's right, the work. What is a and b? Of course, the factors. And how to find the unknown factor? It is necessary to divide the work into a famous one. So a = S: b, just like b = S: a. To practice, solve the problem. The length of the garden is 6 meters, and the area is 30 m 2 . Find the width of the garden plot.
Thus, this article said how to find the area and perimeter of a rectangle whose width and length are known.