Transcript Three-Dimensional Figures and Spatial Reasoning

Three-Dimensional Figures and
Spatial Reasoning
Lesson 9-7
Vocabulary
A three-dimensional figure is a figure that does not lie in a
plane. It has three dimensions: length, width, and height.
A face is a flat surface on a 3D figure.
An edge is a segment
where two faces meet.
A vertex is a point
where two or more
edges meet.
Prisms
A prism is a 3D figure with two parallel and congruent faces that are
polygons. These faces are called bases. The lateral (side) faces are
rectangles. Prisms are named for the type of bases they have.
Rectangular Prism
Pentagonal Prism
Pyramids
A pyramid is a 3D figure with one polygon for a base. The
other faces are triangles, and they connect at one vertex called
the apex. A pyramid is named for its base.
Rectangular Pyramid
Triangular Pyramid
Other 3D Shapes
A cylinder has two congruent parallel
bases that are circles. The lateral side is a
rectangle
A cone has one circular base and one
vertex.
A sphere has no base.
What is this shape?
Octagonal prism
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