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Perimeter is the distance covered around a two-dimensional shape. Learn how to calculate the perimeter of different shapes such as circle, triangle, square, rectangle, polygon and more with formulas and examples.
- 2πr
- 4a, where a is the length of a side of square
- Perimeter Formula
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- What Is A perimeter?
- How to Find Perimeter
- Real – World Applications
- Solved Examples on Perimeter
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In geometry, the perimeter of a shape is defined as the total length of its boundary. The perimeter of a shape is determined by adding the length of all the sides and edges enclosing the shape. It is measured in linear units of measurement like centimeters, meters, inches, or feet. Let’s try to calculate the perimeter of the following shape: Perime...
Perimeter of a Regular Shape
We know that the length of each side of a regular polygon is the same. Therefore, Perimeter of regular polygon = sum of all its sides = number of sides ✕ length of one side. For example, look at the given regular pentagon. The perimeter of the given regular pentagon can be calculated as follows: Number of sides = 5 Length of one side = 4 cm Therefore, Perimeter = number of sides ✕ length of one side = 5 ✕ 4 = 20 cm The given table summarizes the formulas to find the perimeter of some regular...
Perimeter of An Irregular Shape
Since the sides of an irregular polygon may not all be the same in length, we use the general formula to find the perimeter of an irregular shape. Therefore, Perimeter of irregular polygon = sum of all sides.
We often use the concept of perimeter in real life. For example, when putting up Christmas lights around the house or when we want to put a fence around the backyard, we find its perimeter to know the length of wire we will need.
Example 1: What is the perimeter of the given figure? Solution: We know that the perimeter of a triangle is given by Perimeter = a + b + c, Where a, b, c = length of three sides. Therefore, For the given triangle, Perimeter = 5 cm + 4 cm + 3 cm = 12 cm Example 2:Calculate the perimeter of the following figure. Solution: The given shape is an irregu...
Learn how to find the perimeter of regular and irregular shapes using linear units of measurement. Explore the formulas, examples, and real-world applications of perimeter with interactive games and practice problems.
Illustrated definition of Perimeter: The distance around a two-dimensional shape. Example: the perimeter of this rectangle is 3737 20 The...
Perimeter is the distance around a two-dimensional shape. Learn how to calculate the perimeter of different shapes, such as triangles, squares, rectangles, circles, sectors and ellipses, with formulas and examples.
Learn what perimeter is and how to find it for different shapes. See examples, formulas, and worksheets on perimeter of squares, rectangles, triangles, circles, and more.
Perimeter is the distance around the outside of a shape. For example, if you walk around the edge of a playground, you're measuring its perimeter. Area is the amount of space inside a shape.
- 8 min
- Sal Khan
Perimeter is a math concept that measures the total length around the outside of a shape. To find the perimeter, you add together the lengths of all the sides. This works for any shape, including triangles, rectangles, pentagons, and even irregular polygons.
- 3 min
- Sal Khan
