Question

如圖，AB，CD是⊙O的直徑，⊙O的半徑為R，AB⊥CD，以B為圓心，以BC為半徑作CED，則CED與CAD圍成的新月形ACED的面積為_______平方單位．

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

Answer 1

B
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