Post on 01-Jan-2016
Geometric Solids
How Can You Describe a Three-Dimensional Figure?
• Solid figures are also called three-dimensional figures. You can describe many three-dimensional figures by counting the number of faces, edges, and vertices they have.
Faces, Edges, and Vertices
• A face of a solid figure is a flat surface in the shape of a polygon.
• An edge of a solid figure is a line segment where two faces meet.
• A vertex of a solid figure is the point where three or more edges meet. The term vertices refers to more than one vertex.
These are some 3-D figures you should be able to recognize and
describe.
Triangular Prism
• 5 faces (2 triangular, 3 rectangular)
• 9 edges• 6 vertices
Rectangular Prism
• 6 rectangular faces• 12 edges• 8 vertices
Cube
• 6 square faces• 12 edges• 8 vertices
Triangular Pyramid
• 4 triangular faces • 6 edges• 4 vertices
Square Pyramid
• 5 faces (1 square, 4 triangular)
• 8 edges• 5 vertices
Curved Surfaces
• Some three-dimensional figures have a curved surface. Some of these figures also have one or two circular surfaces called bases.
Here are some three-dimensional figures with curved surfaces that you should be able to recognize
and describe.
Cylinder
• 1 curved surface• 2 circular bases
Cone
• 1 curved surface• 1 circular base• 1 vertex
Sphere
• 1 curved surface
Quiz
• Use your response pad to answer these questions.
This shape is called a cone. The arrow is pointing to the cone’s ___.
A. vertex
B. plane
C. base
D. edge
This block is in the shape of a cube. The arrow is point to the
cube’s ______.
A. edge
B. face
C. vertex
D. base
The refrigerator has the shape of a rectangular prism. The arrow is pointing
to the _____ of the rectangular prism.
A. base
B. vertex
C. edge
D. face
The arrow is pointing to the ____ of the figure.
A. edge
B. face
C. vertex
D. base
Name the figure.
A. pyramid
B. cone
C. cylinder
D. prism
Name the figure.
A. cylinder
B. cube
C. cone
D. sphere
This toy has the shape of a ___.
A. cone
B. square pyramid
C. triangular prism
D. cube
How many faces?
A. 12
B. 4
C. 6
D. 8
How many edges does this figure have? What is the name of the figure?
A. 8, rectangular prism
B. 5, rectangular prism
C. 8, square pyramid
D. 5, square pyramid