单项选择题
In the figure below, vertex Q of square OPQR is on a circle with center O. If the area of the square is 8, what is the area of the circle？（）
A.A
B.B
C.C
D.D
E.E
单项选择题
In the figure below, vertex Q of square OPQR is on a circle with center O. If the area of the square is 8, what is the area of the circle？（）
A.A
B.B
C.C
D.D
E.E