Find the area of the irregular figure

When turned about its axis of rotation, which shape could have created this three-dimensional object?

How do i find the missing angle measure in a polygon

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.