3D Solids Vocabulary 6 th Grade Math. Polygon A polygon is a closed figure formed by three or more...
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Transcript of 3D Solids Vocabulary 6 th Grade Math. Polygon A polygon is a closed figure formed by three or more...
![Page 1: 3D Solids Vocabulary 6 th Grade Math. Polygon A polygon is a closed figure formed by three or more line segments.](https://reader036.fdocuments.net/reader036/viewer/2022062409/56649ecf5503460f94bdd77c/html5/thumbnails/1.jpg)
3D Solids Vocabulary
6th Grade Math
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Polygon
A polygon is a closed figure formed by three or more line segments.
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Examples of Polygons
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These Figures ARE NOT Polygons
Why is this figure not a polygon?
It is not made of 3 or more line segments!
Why is this figure not a polygon?
It is not CLOSED!
![Page 5: 3D Solids Vocabulary 6 th Grade Math. Polygon A polygon is a closed figure formed by three or more line segments.](https://reader036.fdocuments.net/reader036/viewer/2022062409/56649ecf5503460f94bdd77c/html5/thumbnails/5.jpg)
Face
A face is a flat surface of a
3-dimensional figure.
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This is a face. This face is a
polygon.
This is a face. It is circular and
may also be called a base.
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Edge
An edge is a line segment where two faces or a face and
lateral surface of a 3-dimensional
figure meet.
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Think about this…
Where do we find the edges on a 3-
dimensional figure?
![Page 9: 3D Solids Vocabulary 6 th Grade Math. Polygon A polygon is a closed figure formed by three or more line segments.](https://reader036.fdocuments.net/reader036/viewer/2022062409/56649ecf5503460f94bdd77c/html5/thumbnails/9.jpg)
This figure has many edges
…and one
more that we
can’t see!
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Does this figure have any edges?
Yes…because the
faces meet the lateral surface.
Face or circular base
Lateral Surface
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Vertex (plural – Vertices)
A point…1) Where three or more edges
of a polyhedron meet.2) Opposite the base of a
cone.
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This triangular pyramid
has 4 vertices.
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Does this cone have a vertex?
Yes! It does have a point opposite
of the face or circular base –
therefore it does have a vertex!
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Basebase of a cone – flat circular part,
which may also be called a face
base of a pyramid -polygonal
region that does not intersect
with other faces at the vertex
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Bases, cont.bases of a prism –
the two parallel and congruent
regions
bases of a cylinder – the two parallel, circular regions
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Cylinder
A cylinder is a 3-dimensional figure with two
parallel, circular bases
or faces.
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Cone
A cone is a 3-dimensional figure with
a circular base or face.
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PrismA prism is a 3-
dimensional figure with two parallel, congruent bases, and all faces that
are parallelograms (rectangles, etc.).
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Naming PrismsPrisms are named
by the shape of their bases (the two sides that are congruent and parallel).
triangular prism
pentagonal prism
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Pyramids
A pyramid is a 3-dimensional
figure with one base and
triangular faces.
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Naming Pyramids
A pyramid is named by the shape of its base.
triangular pyramid
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Definitions adapted from…
•http://intermath.coe.uga.edu•Geometry to Go, published by
Great Source•Teaching Student Centered
Mathematics, Grades 5-8, by John Van de Walle &
LouAnn H. Lovin