If a=30°, a=12, b=28 how many triangles can be constructed?

Joanie watched 1 out of three of a movie in the morning

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?

If the diagram polygon abcd is a reflection across ef to make polygon a'b'c'd'.