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Perimeter
Find the perimeter of a:using the equation:  
Circle
(The perimeter of a circle is called Circumference)
c = 3.14159*2*r
or

c = 3.14159*d

- or -
Parallelogram p = 2a + 2b
Rectangle p = 2l + 2w
Trapezoid  
Triangle p = a + b + c


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