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Area is the total space within a shape or region. Perimeter is the length along the outside edge (circumference for a closed curve).

Different shapes have different formulas.

Examples:

For a square:

Area = (side)2

Perimeter = 4 x (side)

For a circle:

Area = (pi)x (radius)2

Perimeter = (2 pi) x (radius)

For a rectangle:

Area = (length) x (width)

Perimeter = (2 x length) + (2 x width)

As you can see, you really have to know which shape you're talking about,

and then pick the right formulas for it.

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Q: What is the formula for area and perimeter?
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