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Some Geometry problems I need some help with!

When a 2-D circle is rotated around a line that it does not touch. What is the name of the resulting figure?

A. Cavalieri section
B. Torus
C. Cross section
D. Annulus

A sphere with radius 16 m is cut by a plane though it’s a great circle. What is the best description of the cross section that is shown?

A. A torus
B. A circle was radius 16 m
C. A circle with radius 8 m
D. A sphere with radius 8 m

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Answer:                                                                                

When a 2-D circle is rotated around a line that it does not touch. What is the name of the resulting figure?  

The answer is annulus

A sphere with radius 16 m is cut by a plane though it’s a great circle. What is the best description of the cross section that is shown?

B. A circle with radius 16 m

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