1.	The exact circumference of a circle with a radius of 6 is ____.
		A.	37.7	B.
		C.		D.
		Hint
	2.	Find the radius of a circle with circumference .
		A.		B.	4
		C.	16	D.	8
		Hint
	3.	In the figure below, the diagonals of the square pass through the center of the circle. Find the exact circumference of the circle.
		A.	28	B.
		C.		D.
		Hint
	4.	Refer to circles B and D in the figure below. If BC = 5 and CD = 5, find AE.
		A.	20	B.	10
		C.	25	D.	15
		Hint
	5.	Find the exact circumference of the circle in the figure.
		A.	4.25	B.	8.5
		C.	17	D.	17
		Hint