Perimeter is the sum of the lengths of all sides of a closed two dimensional shape. (End of 2 or more lines meets the other end) The standard symbol for perimeter in mathematics is the letter P.
The perimeter of the figure above is: P = a + a + a + a or P = 4a
The perimeter of the figure above is: P = a + b + a + b or P = 2a + 2b
The perimeter of an equilateral triangle is:
P = a + a + a or P = 3a
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