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From Wikipedia
A perimeter is a path that surrounds an area. The word comes from the Greek peri (around) and meter (measure). The term may be used either for the path or its length  it can be thought of as the length of the outline of a shape. The perimeter of a circular area is called circumference.
Practical uses
Calculating the perimeter has considerable practical applications. The perimeter can be used to calculate the length of fence required to surround a yard or garden. The perimeter of a wheel (its circumference) describes how far it will roll in one revolution. Similarly, the amount of string wound around a spool is related to the spool's perimeter.
Formulae
Perimeter is about the distance around all of a shape. Perimeters for more general shapes can be calculated as any path with \int_0^L \mathrm{d}s where L is the length of the path and ds is an infinitesimal line element. Both of these must be replaced with other algebraic forms in order to be solved: an advanced notion of perimeter, which includes hypersurfaces bounding volumes in ndimensionaleuclidean spaces can be found in the theory of Caccioppoli sets.
From Yahoo Answers
Answers:The diagonals are perpendicular and bisect each other (cut each other in half). So drawing in the diagonals you have right triangles where the length of a side of the rhombus is the hypotenuse and the legs are 16/2 and 30/2. 8^2 + 15^2 = L^2 64 + 225 = L^2 289 = L^2 17 = L The perimeter of the rhombus is 4(17) = 68.
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Answers:Hi, http://i735.photobucket.com/albums/ww355/leicande/geom36.jpg?t=1259869797 Using Pythagorean Theorem: a + b = c 2 + 3 = c 4 + 9 = c 13 = c c = 13 That is only one side, we are to find the perimeter; Perimeter of a rhombus = 4S 4( 13) = 4 13 4 13 = 14.4 cm <<< ANSWER :)
Answers:A rhombus has four sides. 20 *4 = 80
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