Lesson
Strategy Focus
14 Make a Table
MATH FOCUS: Solid Figures
Learn About It
Read the Problem Len made models of a triangular prism and a triangular
pyramid. Both solid figures have a triangle as a base. Which solid
figure has more faces? Does the triangular prism have more
edges, or more vertices? What about the triangular pyramid?
Triangular Prism
Triangular Pyramid
Reread Ask yourself these questions.
What is the problem about?
●
What questions am I asked to answer?
●
Mark
the Text
Search for Information Read the problem again.
Record What do you need to find to answer the questions?
© Triumph Learning. OT112eIW14
I need the number of
in each solid figure.
I need the number of
prism.
in the triangular
I need the number of
pyramid.
in the triangular
Find a strategy that helps you use this information to solve the
problem.
120 Unit 4 Using Geometry
Decide What to Do
You have drawings of a triangular prism and a triangular pyramid.
You need to know the numbers of faces, edges, and vertices of each
solid figure. Then you need to compare the number of faces, edges,
and vertices of each shape.
Ask How can I compare the numbers of faces, edges, and vertices?
I can count the faces, edges, and vertices of each solid figure.
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I can use the strategy Make a Table to keep track of the results.
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Use Your Ideas
Step 1
Look at the drawings. Count and record the number of
faces, edges, and vertices of each solid figure.
Solid Figure
Triangular Prism
A table can help
you organize
the information.
Triangular Pyramid
Number of Faces
Number of Edges
Number of Vertices
Step 2
Compare the number of faces.
A
Step 3
has more faces.
Compare the number of edges and vertices of each solid
figure.
A triangular prism has more
than
.
A triangular pyramid has more
than
.
Review Your Work
© Triumph Learning. OT112eIW14
You can draw on the drawings to check your results. Draw a dot at
each vertex. Trace along each edge. Shade each of the faces.
Explain
How does the table help you answer the question? What
other questions can you answer using the table?
121