In the figure above, if \(MN = 2,\) then the area of the circle with the center \(O\) is

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2019-04-30_1047.png
In the figure above, if \(MN = 2,\) then the area of the circle with the center \(O\) is

A. \(\dfrac{\pi}4\)

B. \(\dfrac{\pi}2\)

C. \(\pi\)

D. \(2\pi\)

E. \(4\pi\)

[spoiler]OA=D[/spoiler]

Source: Princeton Review
Source: — Problem Solving |