If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

# Perimeter & area

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. For example, if you want to put new tiles on your kitchen floor, you need to know the area of the room to know how many tiles to buy. Created by Sal Khan.

## Want to join the conversation?

• How would I use multiplication instead of addition to find the perimeter?
• will tell you
• If you add each side, then is the total your area or (base x height)?
• When you add each side you get the perimeter.
When you multiply the base times height you get area.
For a 3-D figure you find the area of the base, then multiply it by the height, and you get the volume.
• How much is a right angle
• 90 degrees , you can tell a right angle because of the small box in the triangle
• what is the easyiest way to know all of this? im like so confused?
• Area=multiply base x height
Hope this helps! :)
• what is the difference between the perimeter and area?
• Perimeter is the distance around the shape.
Area is the space inside the shape.
• How do you find the area and perimeter of a square if it's sides are in a fraction.
• You would continue the same way you would if they were whole numbers. Multiple or add them depending on whether you are finding area or perimeter.
• Could I use division in perimeter and area
• In perimeter, no. In area, you would have to take the reciprocals of the two sides given and divide them as fractions, but that would be an extra step. So, basically, no :)
• How do you find area?
• for finding area you have to multiply the length and width
• Is it not more logical to say "perimeter of ABCDA" rather than ABCD? You don't go all the way around when you say it like "ABCD" to complete the perimeter. It's only assumed that you count in that last side of it.
• That is the thing. It is assumed. If you have 4 vertices, you list 4 letters for each of them. Listing 5 vertices indicates a pentagon, not a quadrilateral.
• When I find an area, do I add or multiply? And does it carry over to my perimeter??
• You multiply for area and add for perimeter

Idk what you mean by carryover, but if you're asking whether the area affects the perimeter then not necessarily.

If you have a square with a side length of 6, then for the perimeter you can either add 6 four times or just do 6*4. You would then get a perimeter of 24.

For area, you would do 6*6 which is 36 (assuming it's the same shape with the same side length).

Hope this helps you ^u^

~Green bear