The figure shows a regular 9-sided polygon inscribed in a circl

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The figure shows a regular 9-sided polygon inscribed in a circle with center O.

Quantity A: The perimeter of the regular polygon

Quantity B:3 times the perimeter of triangle OAB

A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、 The relationship cannot be determined from the information given.

答案：B

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