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The radius of the circle O is r. AO is perpendicular to OB. What is the area of the shaded part?

1：∠BAC = 30°

2：∠CAO = 30°
  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2) TOGETHER are NOT sufficient.
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正确答案: D

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