Any geometrical figure has several measurements. One of them – perimeter. It is the simplest to find it, as a rule. It is only necessary to know the size of all parties of a geometrical figure.
It is required to you
- Ruler, sheet of paper, handle.
Instruction
1. Sort out, what isprismthis geometrical figure can have , and what appearance. Consider that the word "prism" is transferred from Latin as "something sawn off". This polyhedron, always has two reasons which are located in the parallel planes and are equal polygons. They can be triangular, quadrangular and also n-coal.
2. Remember that the quantity of other (side) sides depends on a type of the basis. If in the basis the triangle, side sides respectively appears three, a quadrangle – four and so on.
3. Keep in mind that edges the side edge is located at an angle 90o to the basis, the prism is called as a straight line. Otherwise – an inclined plane. If the direct prism in the basis has a regular polygon, it will turn into the correct prism. An example of a similar geometrical figure – a cube.
4. To calculate prism perimeter, find perimeters of the bases and side sides of a prism, and put all sizes with each other. For this purpose measure by means of a line of length of the parties (or edges) by each of sides. Also count perimeter of each polygon.
5. Simplify the task. As the size of both bases is identical, measure lengths of edges only at one of them. Put the sizes of all parties and increase the turned-out sum by two.
6. If the bases have edges of the equal size, find quantity of identical side sides. Measure lengths of the parties of one of these sides, calculate its perimeter. Increase the turned-out value by the total number of identical sides.
7. Separately count perimeter of each of those side sides which never repeats.
8. Put all counted perimeters – two bases, the repeating side sides, and those side sides which have no analog. Total amount will be equal to prism perimeter.