If you had a need for any purposes to measure perimeter or some other geometrical size, it is not obligatory for you to be the expert in geometry at all. There is a number of ways to cope with measurement of such sizes, without resorting to various difficult calculations and calculations. However, calculations with use of necessary formulas will be much more precisely. Therefore if you need the maximum accuracy of measurement, find suitable formulas better, remember as to use them and start measurements. If some errors do not upset you, will use a usual thread, for example.
Instruction
1. So, the perimeter represents the sum of lengths of the parties of any figure. It is known practically to all. But here is how it is correct to measure it, unfortunately, not each person is capable to explain at once, without preparation. Sposobov exists a little and the choice of each of them depends mainly on the figure which too a set.
2. To measure square perimeter, look at it attentively. It has four parties which are equal on length. Thus, for calculation of perimeter use a formula: P=4a; an in this formula designates length of one of the parties of a square. This formula it is possible will explain and it is much simpler. Namely, measure one party of a square and multiply it by 4, that is by the number of the parties.
3. To measure perimeter of a rhombus or rectangle, pay at first the attention to a form of these geometrical figures. At each of them on two identical sides. Respectively, and the formula of calculation of perimeter of these figures will be following: P=2(a+b); an and b in this formula designate the parties which adjoin with each other.
4. To measure triangle perimeter, remember that triangles are different. They can be with right angles, can be wrong, can be and isosceles. For this reason for measurement of their perimeter use a formula: P=a+b+c. In other words most precisely to measure perimeter of a triangle necessary to you, take values of lengths of each of three of its parties, and then by addition receive actually perimeter.
5. To measure circle perimeter, use absolutely special formula. Perimeter of a circle it is accepted to call length of its circle. Use the following formula for calculation of perimeter of a circle: P=d*3.14; d in this formula designates diameter of a circle, and the second part of a formula is the known number ""p"", la of measurement of perimeter of this unusual figure applied in geometry specially.