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In the figure above, the radius of circle O is 3, and m∠AOB=60. What is the perimeter of the shaded region

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What is the area of a circle whose radius is the diagonal of a square whose area is 4
(A) 2π
(B) 2π

(C) 4π
(D) 8π
(E) 16π
单项选择题
Camille’s average on her 6 math tests this marking period is 75. Fortunately for Camille, her teacher drops each student’s lowest grade, and this raises her average to 85. What was her lowest grade
A．20
B．25
C．30
D．40
E． 50
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