Perimeter
From Open Encyclopedia
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
As a general rule, the perimeter of a polygon can always be calculated by adding all the length of the sides together.
Circles: For circles the equation is P= 2 π r, where r is the radius and π is the mathematical constant, or about 3.14. (An equivalent formula is P= π d, where d is the diameter). The equation for area is A= πr². R is the radius and pi is about 3.14. Pi comes from the equation c/d, which is the circumference of a circle divided by the diameter.
Triangles: For triangles the equation for perimeter is P=Side1 + Side2 + Side3. The area can be calculated by the equation A=.5bh. B is the length of the base and H is the height of the triangle.
Quadrilaterals: For quadrilaterals the equation for perimeter is P=Side1 + Side2 + Side3 + Side4.
See also
See also:
ca:Perímetre de:Umfang es:Perímetro it:Perimetro pt:Perímetro nl:Perimeter ru:Периметр simple:Perimeter zh:周界
