Perimeter
Encyclopedia : P : PE : PER : Perimeter
The perimeter is the distance around a given two-dimensional object. The word perimeter is a Greek root meaning measure around, or literally "around measure." Perimeter can be calculated for any two dimensional object, with the right formula.
Practical uses
Perimeter and area play a great role in today's world. Perimeter is used in calculating the border of an object such as a yard or flowerbed when a fence or other border is being installed around the edges. Area is used when all the area inside of a perimeter is being covered with something, such as a yard being covered with sod or fertilizer.Formulas
Polygons
As a general rule, the perimeter of a polygon can always be calculated by adding all the length of the sides together. So, the formula for triangles is [P=a+b+c], where [a], [b] and [c] stand for each side of it. For quadrilaterals the equation is [P=a+b+c+d]. For equilateral polygons, [P=na], where n is the number of sides and a is the side length.Circles
For circles the equation is- [ P = 2 \cdot \pi \cdot r]
- [ P = d \cdot \pi ]
- [P] stands for the perimter,
- [r] stands for the radius
- [\pi] is the mathematical constant pi ([\pi=3.14159265...])
- [d] stands for the circle's diameter
See also
See also:
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