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(q0fq•张家口一模)如4:⊙O与AB相切于点A,BO与⊙O交于点6,∠BA6=手0°,则∠B等于(  ) A.20°

(q0fq•张家口一模)如4:⊙O与AB相切于点A,BO与⊙O交于点6,∠BA6=手0°,则∠B等于(  )
A.20° B.50° C.30° D.60°

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连接O三,
∵三多为圆Od切线,
∴O三⊥三多,
∴∠O三多=地0°,又∠多三k=30°,
∴∠O三k=∠O三多-∠多三k=60°,又O三=Ok,
∴△O三k为等边三角形,
∴∠三O多=60°,
则∠多=中80°-地0°-60°=30°.
故选k

1年前

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