九年级任务单

九上数学《直线与圆的位置关系（3）》课堂学习任务单

任务一：合作探究

如图,点P 是⊙O 外一点，PA ，PB 分别切⊙O 于A ，B 两点。比较PA ，PB 两条线段的长短，你发现了什么？你能证明你的发现吗？

任务二：新知应用

如图，O 是?AB 所在圆的圆心，AC ，BC 分别与⊙O 相切

于点A ，B 。已知o ACB 60=∠，OC=100cm ，求点C 到⊙O 的

切线长。

任务三：深入应用

如图，⊙O 表示皮带传动装置的一个轮子，传动皮带MA ，NB 分别切⊙O 于点A ，B 。延长MA ，NB ，相交于点P 。已知o APB 60=∠，AP=24cm ，求两切点间的距离和?AB 的长。

学习评价

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