How could you slice the cone so that the cross-section is a triangle?
Look at the cone. What part resembles a triangle?
What cross-section do you get if you slice the cone horizontally?
Look at the top of the cone. What shape is this?
Lois is thinking of a shape. She says that no matter how you slice it, the cross-section will always be a circle. What shape is she thinking of? Draw and describe this shape on your paper.
A sphere. Be sure to draw the shape.