wall display 3dshapes
DESCRIPTION
3D SHAPES PROPERTIESTRANSCRIPT
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3D SHAPES Three-dimensional shapes, because there are 3 dimensions
HEIGHT, WIDTH and DEPTH
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HEIGHT, WIDTH AND DEPTH
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BASIC PROPERTIES
FACES, VERTICES and EDGES 3D shapes can be described in 3 ways:
Faces – the sides of the shape
Vertices – the corners
Edges – where the faces meet FACES
VERTICES EDGES
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SOME FAMOUS SHAPES
CONE
Faces – 2
Edges – 1
Vertices - 1
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CYLINDER
Faces – 3
Edges – 2
Vertices - 0
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SOME FAMOUS SHAPES SPHERE
Faces – 1
Edges – 1
Vertices - 0
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SOME FAMOUS SHAPES SQUARE BASED
PYRAMID
Faces – 5
Edges – 8
Vertices - 5
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SOME FAMOUS SHAPES CUBE
Faces – 6
Edges – 12
Vertices - 8 SOME FAMOUS SHAPES
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TRIANGULAR PRISM
Faces – 5
Edges – 9
Vertices - 6
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TRIANGULAR BASED PYRAMID
(Tetrahedron)
Faces – 4
Edges – 6
Vertices - 4
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CUBOID (square prism)
Faces – 6
Edges – 12
Vertices - 8
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3D SHAPES can be divided in
POLYHEDRA and
NON POLYHEDRA
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POLYHEDRA also polyhedrons
A polyhedron is a 3d shape with
FLAT FACES
(from Greek poly- meaning "many" and -edron meaning "face").
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We name polyhedra according to the
NUMBER OF FACES
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4 faces TETRAHEDRON 5 faces PENTAHEDRON 6 faces HEXAHEDRON 7 faces HEPTAHEDRON … 20 ICOSAHEDRON
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Can you name these shapes?
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POLYHEDRA can be …
REGULAR and
IRREGUALR
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REGULAR POLYHEDRA
All its faces are regular polygons
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There are only 9 Regular Polyhedra
Tetrahedron Cube Octahedron Dodecahedron Icosahedron
Small Stellated Great Great Stellated Great Dodecahedron Dodecahedron Dodecahedron Icosahedron
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IRREGULAR POLYHEDRA
NOT all its faces are regular polygons
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NON POLYHEDRA also non polyhedrons
A polyhedron is a 3d shape with
any
CURVED FACES
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The most famous are
cone cylinder sphere
torus
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POLYHEDRA
NON POLYHYEDRA
3D SHAPES (height, width, depth)
REGULAR
IRREGULAR
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POLYHEDRONS IN NATURE
LIMPET
WASP NEST POMEGRANATE PIPE