SS3.4
Demonstrate understanding of 3-D objects by analyzing characteristics including faces, edges, and vertices.

[C, V]

Indicators for this outcome
(a)

Observe and describe the faces, edges, and vertices of given 3-D objects, including cubes, spheres, cones, cylinders, pyramids, and prisms (e.g., drum, tipi, South American Pyramids, and other objects from the natural environment).

(b)

Critique the statement "the face of a 3-D object is always a 2-D shape".

(c)

Observe and describe the 2-D shapes found on a 3-D object.

(d)

Construct a skeleton of a given 3-D object and describe how the skeleton relates to the 3-D object.

(e)

Determine the number of faces, edges, and vertices of a given 3-D object and explain the reasoning and strategies.

(f)

Critique the statement "a vertex is where three faces meet".

(g)

Sort a set of 3-D objects according to the faces, edges, or vertices and explain the sorting rule used.

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