Question

如图，AB，CD是⊙O的直径，⊙O的半径为R，AB⊥CD，以B为圆心，以BC为半径作CED，则CED与CAD围成的新月形ACED的面积为_______平方单位．

1. A.
   （π-1）R²
2. B.
   R²
3. C.
   （π+1）R²
4. D.
   πR²

Answer 1

B
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