INTRO

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Perimeter is the total distance around the border of a 2D shape. To find the perimeter of a polygon, we need to find the length of each of its sides, then add them all together.To help us visualize this process, let's imagine we want to brighten up a room by lining it with some string lights.The perimeter is like the total length of string lights we need to line the walls.So the perimeter of this room is also equal to $2+2+2+2=8$. Perimeters are lit ✨.Check out our or explore our and sections to learn more about finding the perimeter of different shapes and test your understanding.

If each of our walls has length $2$, then we need a total string light length of $2+2+2+2=8$ to line the room.

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Lesson

Practice

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CALCULATOR

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## Perimeter of Polygons Calculator

### Step 1. Determine whether the polygon is regular.

KEY STEPS

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## How to Find the Perimeter of Polygons

### Step 1. Determine whether the polygon is regular.

### Step 2. Count the number of sides.

### Step 3. Determine the lengths of each side of the polygon.

If the shape is not regular, make sure you find the length of every side you counted in Step 2.

### Step 4. Add up the side lengths.

$perimeter=side length×number of sides$

If the shape is not regular, add up all the side lengths you found in Step 3.$perimeter=side length 1+side length 2+...$

LESSON

— Perimeter of Polygons

## Perimeter of Polygons

Finding the perimeter of a polygon is like finding the total length of string lights needed to line a room.If we have a regular polygon, meaning the sides are all the same length, we only need to find the length of one side and then multiply it by the number of sides:

PRACTICE

— Perimeter of Polygons

## Practice: Perimeter of Polygons

Question 1 of 8: Find the perimeter of this regular polygon:

#### Step 1. Determine whether the polygon is regular.

The shape is regular if all the sides are the same length. What is this shape?

CONCLUSION

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Incredible job, look at you go! Thanks for checking out this lesson ☺️🙏. Where to next?

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