PERIMETERS AND CIRCUMFERENCES

Perimeter and circumference have the same meaning; that is, the distance around. Generally, circumference is applied to a circular object and perimeter to an object bounded by straight lines.

PERIMETER OF A POLYGON

The perimeter of a triangle, quadrilateral, or any other polygon is actually the sum of the sides.

Write an equation for the perimeter(P) of the quadrilateral above.

P=a+b+c+d

If this figure were a rectangle,

the formula P= a + b + c + d would still apply, but since opposite sides are equal, we could substitute a for c and b ford and write

P=2a+2b

If the figure were a square, the formula would become:

P=4a

We may, by the same reasoning, establish that the formula for the perimeter of any regular polygon of n sides having a sides is:

P = n(s)

CIRCUMFERENCE OF A CIRCLE

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