Cool math .com - Perimeters of Geometric Shapes - Circles, Triangles, Polygons and oddly shaped regions

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Perimeters
Formulas and instructions for finding the perimeters of circles (circumferences), kites, parallelograms, rectangles, rhombi, squares, trapezoids and oddly shaped geometric objects
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circumference of a circle	perimeter of a kite	perimeter of a parallelogram
perimeter of a rectangle	perimeter of a rhombus	perimeter of a square
perimeter of a trapezoid	perimeter of an oddly shaped geometric figure

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The circumference of a circle (the perimeter of a circle):
	The circumference of a circle is the perimeter -- the distance around the outer edge. Circumference = where r = the radius of the circle and pi = 3.141592...

The perimeter of a kite:
To find the perimeter of a kite, just add up all the lengths of the sides:

The perimeter of a parallelogram:

To find the perimeter of a parallelogram, just add up all the lengths of the sides:

    Perimeter
    = a + b + a + b
    = 2a + 2b

The perimeter of a rectangle:
	To find the perimeter of a rectangle, just add up all the lengths of the sides: Perimeter = L + w + L + w = 2L + 2w

The perimeter of a rhombus:
To find the perimeter of a rhombus, just add up all the lengths of the sides:

The perimeter of a square:
To find the perimeter of a square, just add up all the lengths of the sides:

The perimeter of a trapezoid:
	To find the perimeter of a trapezoid, just add up all the lengths of the sides: Perimeter = a + b + c + B

How to find the perimeter of strangely shaped objects:
Let's find the perimeter of this thing... We, basically, need to add up all the outside edges. And we'll just have to do that piece by piece!
Here are all the missing pieces: Now, add them all up! 5 + 8 + 6.28 + 6 + 2 + 2 + 2 + 3 = 34.28