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Mathematics 7 Online
OpenStudy (anonymous):

What shape could be rotated about the y-axis as shown below to form a square pyramid? a. Sphere b. Cone c. Cylinder d. None of the above

OpenStudy (anonymous):

Directrix (directrix):

The square pyramid looks like this.

OpenStudy (anonymous):

so d?

Directrix (directrix):

So, the answer will have to be a cross section of it.

Directrix (directrix):

That's what I think, D. I don't see that it is possible to spin any of the solids A, B, or C to get that pyramid.

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