Perimeter and area
Perimeter is the distance around the outside of a shape: for a rectangle that is 4 units long and 3 units wide, you add up all four sides to get a perimeter of 4 + 3 + 4 + 3 = 14 units. Area is how much flat space is inside a shape, found for that same rectangle by multiplying length times width, 4 x 3 = 12 square units.
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