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I) [0.33 pts. each] For each surface, look at the clues and then write down an equation whichdescribes that surface. Assume that the presentations are standard with the positive x-axis coming out of the paper,etc. (a) It's a cylinder. The radius of the cylinder is 2.

(b) The trace in the xy-plane is the unit circle: x² + y² = 1.

(c) This right (standard) circular cone opens out onto the negative z-axis.

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