1. Polyhedra Mikhаilichenko Yelena-Maths teacher
Tsoy Svetlana- English teacher

2. Polyhedron is a geometric body which consists of a finite number of intersecting planes

3. Prism is a polyhedron consisting of two parallel polygons, basing on finite numbers of rectangles which form a side surface.
V=SH

4. Pyramid is a geometric body which consists of some triangles with common vertex and the base.
V=1/3 SH

5. Cube is a prism with equal faces.
V= a³
,where a is an edge.

6. Regular Polyhedra

7. Non of the geometric body does not possess such beauty as regular polyhedra. There are 5 types of polyhedra: tetrahedron, cube, octahedron, dodehedron and icosahedron.

8. The Euler characteristic
The number of faces F
The number of vertices V
The number of edges E
Regular polyhedron
F+V-E=24 4 6
tetrahedron 2 8 12
cube
octahedron 20 30
dodecahedron
icosahedron

9. Regular Polyhedra in nature