一道有关于圆的切线的数学题(偶初三的)图示为以O为圆心的两个同心圆,大圆的弦AB是小圆的切线,C为切点,弦AB长4cm,求两圆所围成的圆环的面积.PS:图无法在现,各位大虾海涵,请自己作图,作出来
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![一道有关于圆的切线的数学题(偶初三的)图示为以O为圆心的两个同心圆,大圆的弦AB是小圆的切线,C为切点,弦AB长4cm,求两圆所围成的圆环的面积.PS:图无法在现,各位大虾海涵,请自己作图,作出来](/uploads/image/z/11005739-35-9.jpg?t=%E4%B8%80%E9%81%93%E6%9C%89%E5%85%B3%E4%BA%8E%E5%9C%86%E7%9A%84%E5%88%87%E7%BA%BF%E7%9A%84%E6%95%B0%E5%AD%A6%E9%A2%98%28%E5%81%B6%E5%88%9D%E4%B8%89%E7%9A%84%29%E5%9B%BE%E7%A4%BA%E4%B8%BA%E4%BB%A5O%E4%B8%BA%E5%9C%86%E5%BF%83%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%90%8C%E5%BF%83%E5%9C%86%2C%E5%A4%A7%E5%9C%86%E7%9A%84%E5%BC%A6AB%E6%98%AF%E5%B0%8F%E5%9C%86%E7%9A%84%E5%88%87%E7%BA%BF%2CC%E4%B8%BA%E5%88%87%E7%82%B9%2C%E5%BC%A6AB%E9%95%BF4cm%2C%E6%B1%82%E4%B8%A4%E5%9C%86%E6%89%80%E5%9B%B4%E6%88%90%E7%9A%84%E5%9C%86%E7%8E%AF%E7%9A%84%E9%9D%A2%E7%A7%AF.PS%3A%E5%9B%BE%E6%97%A0%E6%B3%95%E5%9C%A8%E7%8E%B0%2C%E5%90%84%E4%BD%8D%E5%A4%A7%E8%99%BE%E6%B5%B7%E6%B6%B5%2C%E8%AF%B7%E8%87%AA%E5%B7%B1%E4%BD%9C%E5%9B%BE%2C%E4%BD%9C%E5%87%BA%E6%9D%A5)
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