The pyramid represents a polyhedron which basis is the polygon, figure sides, isosceles triangles, meet in one top. The ability to do development of a pyramid can be useful not only at high school during creation of models of volume figures, but also in everyday life for production of hand-made articles or elements of a decor.
It is required to you
- - ruler;
- - protractor;
- - paper;
- - pencil.
Instruction
1. Make the development of a pyramid consisting of the correct triangles. Determine the desirable length of the party of a triangle. Draw the correct triangle which parties are twice more than the set size. Note the middle of each party.
2. Connect the central points on the parties of a triangle so that in a figure the entered triangle turned out. The internal triangle is the basis of a pyramid, the others – sides.
3. Make development of a pyramid in which basis the square lies. For this purpose draw a square of the necessary size. The top side of a square forms the basis of the isosceles triangle which is pyramid side. Draw an isosceles triangle adjacent to a square.
4. Measure a corner at triangle top. From sides of a figure lay off the same number of degrees once to the left, two times to the right. Construct one isosceles triangle, two on the right at the left, the parties of figures are adjacent. Observe accuracy, if necessary measure corners of triangles and at the basis.
5. Also just to make development of a pyramid in which basis any regular polygon lies. Construct to five - or a hexagon, over it draw necessary quantity of sides of a pyramid in the form of isosceles triangles with the adjacent parties. The bases of figures are equal to the party of a polygon.
6. If it is necessary to make development of a pyramid which basis is the rectangle, it is expedient to build pyramid sides from each party of a rectangle. You watch that heights of isosceles triangles were equal.
7. Make a pyramid of the prepared development. For this purpose leave places for pasting of a polyhedron. Cut out preparation, bend development on the planned lines. Accurately stick together a pyramid.