How to find the perimeter of a rectangle? (Mathematics)

2024 Author: Angel Austin | [email protected]. Last modified: 2023-12-17 05:14

Mathematics is a rather difficult science. That is why some students may have trouble understanding some topics. This article is written to help parents explain difficult material 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 the perimeter? These are the lengths of all sides added 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 sides lying opposite each other are equal. So you can take two lengths and two widths of a rectangle and add 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.

Still may arisesuch a situation: given one side and the perimeter, you need 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. Second option: P=2(a+b), hence b=P:2-a. That's all. All material on the topic is given. Nothing complicated, right?

Area of a rectangle

What is area? In simple terms, area is the number of any units of measurement inside a rectangle (or any other shape). Denote the area by the letter S. Then S=ab, where a is the length, b is the width of the rectangle.

And what if the area and one of the sides are known? Now let's find out. What is an area? That's right, work. What is a and b? Of course, multipliers. How to find the unknown factor? It is necessary to divide the work into known. 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 m². Find the width of the garden plot.

Thus, this article talked about how to find the area and perimeter of a rectangle whose width and length are known.