Page 181 - NUMINO TG_2A
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Activity 2 Parts of Solid Figures
jOb ective Learn how many faces, edges, and vertices solid figures have.
1. Textbook Instructions Activity 2 Parts of Solid Figures
Explain what vertex, edge, and face are. Solid figures are made of faces, edges, and vertices.
Then, instruct them to use solid figures to
count the number of faces, edges, and vertex A cube has 6 faces,
vertices of solid figures. 12 edges, and 8 vertices.
A face is a flat surface on a solid figure.
An edge is formed when 2 faces meet. A face is a flat surface on a solid figure.
A vertex is formed when 3 or more edges face An edge is formed when 2 faces meet.
meet.
A vertex is formed when 3 or more
The following is an example of how you can edges meet.
teach about the face, edge, and vertex of
solid figures. edge
Hold up a cube and ask the following
questions. 1 Use the solid figures. Color the figure that matches the number
How many flat surfaces are there in a
cube? This equals the number of faces. of faces, edges, and vertices.
6.
How many times do faces meet in a a 6 faces, 12 edges, 8 vertices b 0 faces, 0 edges, 0 vertices
cube? This equals the number of edges.
12. c 5 faces, 8 edges, 5 vertices d 6 faces, 12 edges, 8 vertices
How many times do 3 or more edges
meet in a cube? This equals the number
of vertices. 8.
1. Have students find a solid figure that fits
the given number of faces, edges, and
vertices.
102
2. Build Understanding
Spheres
Some students may have difficulties in understanding that a sphere does not have faces. In this case,
explain that it can only be a face if it is a flat surface.
Explain why a sphere does not have faces, edges, or vertices.
A sphere only has a curved surface and no flat surfaces. Therefore, there is no face.
There are no faces, so edges where 2 faces meet cannot exist.
There are no edges, so vertices where 3 edges meet cannot exist.
164 NUMINO Teacher s Guide
jOb ective Learn how many faces, edges, and vertices solid figures have.
1. Textbook Instructions Activity 2 Parts of Solid Figures
Explain what vertex, edge, and face are. Solid figures are made of faces, edges, and vertices.
Then, instruct them to use solid figures to
count the number of faces, edges, and vertex A cube has 6 faces,
vertices of solid figures. 12 edges, and 8 vertices.
A face is a flat surface on a solid figure.
An edge is formed when 2 faces meet. A face is a flat surface on a solid figure.
A vertex is formed when 3 or more edges face An edge is formed when 2 faces meet.
meet.
A vertex is formed when 3 or more
The following is an example of how you can edges meet.
teach about the face, edge, and vertex of
solid figures. edge
Hold up a cube and ask the following
questions. 1 Use the solid figures. Color the figure that matches the number
How many flat surfaces are there in a
cube? This equals the number of faces. of faces, edges, and vertices.
6.
How many times do faces meet in a a 6 faces, 12 edges, 8 vertices b 0 faces, 0 edges, 0 vertices
cube? This equals the number of edges.
12. c 5 faces, 8 edges, 5 vertices d 6 faces, 12 edges, 8 vertices
How many times do 3 or more edges
meet in a cube? This equals the number
of vertices. 8.
1. Have students find a solid figure that fits
the given number of faces, edges, and
vertices.
102
2. Build Understanding
Spheres
Some students may have difficulties in understanding that a sphere does not have faces. In this case,
explain that it can only be a face if it is a flat surface.
Explain why a sphere does not have faces, edges, or vertices.
A sphere only has a curved surface and no flat surfaces. Therefore, there is no face.
There are no faces, so edges where 2 faces meet cannot exist.
There are no edges, so vertices where 3 edges meet cannot exist.
164 NUMINO Teacher s Guide
