Which two-dimensional shape can be rotated about the y-axis to create a cylinder which has a smaller diameter than height? note: use all lowercase letters in your answer to receive credit.

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?