如图,已知⊙O的直径CD垂直于弦AB,∠ACD=22.5°,若CD=6 cm,则AB的长

如图,已知⊙O的直径CD垂直于弦AB,∠ACD=225°,若CD=6 cm,则AB的长为

A4 cm             Bcm          Ccm          Dcm

答案

B

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