Презентация к уроку геометрии по теме Многогранники на английском языке

Polyhedra Mikhаilichenko Yelena-Maths teacher Tsoy Svetlana- English teacher

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

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

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

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

Regular Polyhedra

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.

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

Regular Polyhedra in nature