三、 综合解答题
17、在边长为1的小正方形网格中,⊿AOB的顶点均在格点上,
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(1)B点关于y轴的对称点坐标为______________
(2)将⊿AOB向左平移3个单位长度得到⊿
,请画出⊿![]()
(3)在(2)的条件下,
的坐标为___________
13、如图,直线a、b被直线c所截,若满足__________________________,则a、c平行。14、如图,
O的半径为3,P是CB延长线上一点,PO=5,PA切
O于A点,则PA=______
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