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# Perimeter: introduction

Perimeter is the distance around the edge of a shape. Learn how to find the perimeter by adding up the side lengths of various shapes. Created by Sal Khan.

## Want to join the conversation?

• Do 3 dimension objects like cubes have perimeter?
• Actually, to answer your question perimeter IS a TWO-DIMENSIONAL measurement. Hope this helps.
• This is strange but why is sometimes the perimeter bigger than the area
• idk its a thing
• what is a meaning of gnus
• Gnus: Imaginary shapes made by Sal Khan.
• perimeter in mixed fractions
• To find the perimeter of a shape, just add the lengths of all the sides.
• Also, if you multiply a fraction by a whole number when doing area, it might become smaller than the perimeter
• What does it matter?
Area and perimeter are 2 different types of measurement. You really can't compare them.
Perimeter measures distance (1-dimention)
Area measures units squared (2-dimensions)
• Why do you have to add up all the three sides?
• The perimeter is defined that way! The perimeter is defined as a sum of all the side lengths of a shape.
• Perimeter is the outside length/measurement of the shape. (For example, if a square's singulair side length is 2m, that you would add: 2+2+2+2= 8 to get the perimeter - since perimeter is the the path that surrounds the shape. I'm not sure if this makes it more confusing for you, but I hope it helps.)
• what is the perimeter of the shapes