Video: Finding Defining and Non-Defining Attributes of 3D Shapes

Complete these sentences about cubes. All cubes _. [A] are blue [B] have 12 equal edges [C] are big. But not all cubes _. [A] have 8 vertices [B] are pink [C] have 8 edges.

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Video Transcript

Complete these sentences about cubes. All cubes are blue, have 12 equal edges, or are big.

Let’s look at the first statement: all cubes are blue. Are all of the cubes blue? Not all cubes are blue. We have a pink one, an orange one, and a blue one. A cube can be any color. Do all cubes have 12 equal edges? Let’s count the edges of the large orange cube: one, two, three, four, five, six, seven, eight, nine, 10, 11, 12.

Now let’s count the edges of the small pink cube: one, two, three, four, five, six, seven, eight, nine, 10, 11, 12. The small blue cube also has 12 edges. All of the cubes have 12 edges. All cubes have 12 equal edges.

Let’s complete the second sentence: but not all cubes have eight vertices, are pink, have eight edges. Let’s count how many vertices or corners the orange cube has: one, two, three, four, five, six, seven, eight. Cubes do have eight vertices, so that statement is false.

Are all cubes pink? No, we have a pink cube, an orange cube, and a blue cube. Cubes can be any colour. All cubes have 12 equal edges, but not all cubes are pink.

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