单项选择题

In the figure below, equilateral triangle ABC is inscribed in circle O, whose radius is 4.Altitude BD is extended until it intersects the circle at E. What is the length of DE（）


A.A
B.B
C.C
D.D
E.E

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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, if the radius of circle O is 10, what is the length of diagonal AC of rectangle OABC （）

A.A
B.B
C.C
D.D
E.E
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