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Geometry 9 Online
OpenStudy (anonymous):

Part 1: Choose a polyhedron. Find an image either online or by taking a picture of something you find in the real world. If you are using the Internet to find this object, make sure to follow the guidelines and safety precautions for completing Internet searches. Part 2: Sketch the net of the polyhedron. Provide a sketch of the net of the polyhedron. Part 3: Identify parts of the polyhedron. List the number of faces, vertices, and edges of the polyhedron. Describe their relationship to the two-dimensional base polygon.

OpenStudy (anonymous):

Part 4: Repeat steps 1–3 with a different polyhedron. Choose a second polyhedron, sketch its net, and identify its parts. Part 5: Test out Euler's formula on both polyhedra images and then answer the following questions. 1. Did Euler's formula work? Why or why not? 2. What other relationships did you find between your two polyhedra? 3. Which do you prefer: looking at a polyhedron as a net or as a 3-D object? Why do you prefer this?

OpenStudy (anonymous):

@phi

OpenStudy (anonymous):

@timo86m @jdoe0001

OpenStudy (phi):

Here are some polyhedrons

OpenStudy (anonymous):

So far ive chosen a triangular prism and a triangular pyramid

OpenStudy (anonymous):

@phi

OpenStudy (phi):

Part 2: Sketch the net of the polyhedron. Provide a sketch of the net of the polyhedron. The net is what you get if you cut up the figure and unfold it.

OpenStudy (anonymous):

how do you describe the relationships of a triangular prism with its 2 dimensional base polygon?

OpenStudy (phi):

The pyramid is not too bad. cut the sides from the pointy top. then unfold

OpenStudy (anonymous):

how do you describe the relationships of a triangular prism with its 2 dimensional base polygon?

OpenStudy (phi):

The question asks List the number of faces, vertices, and edges of the polyhedron. Describe their relationship to the two-dimensional base polygon. The number of faces of the triangular prism is top and bottom + 3 sides or 5 total faces. The number of faces is 2 more than the number of edges in the base polygon.

OpenStudy (anonymous):

how do you describe the relationships of a triangular pyramid with its 2 dimensional base polygon?

OpenStudy (anonymous):

@phi

OpenStudy (phi):

what did you get for List the number of faces, vertices, and edges of the triangular prism?

OpenStudy (anonymous):

5 faces, 9 edges, 6 verticies

OpenStudy (phi):

the base has 3 edges and 3 vertices. the 3 edges correspond to the 3 side faces. for every vertex on the base there is a corresponding vertex on the top, so the figure has twice as many vertices as its base face.

OpenStudy (anonymous):

what about for triangular pyramid????

OpenStudy (anonymous):

@phi

OpenStudy (phi):

a triangular pyramid has a base with 3 edges and 3 vertices how do the number of faces, edges and vertices compare to that ?

OpenStudy (anonymous):

6 edges, 4 faces, 4 verticies

OpenStudy (anonymous):

@phi

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