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Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i