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已知点P是直线 （ ＞0，）上一定点，点A是 轴上一动点（不与原点重合），连结PA，过点P作PB⊥PA，交 轴B，探究线段PA与PB 的数量关系. 小题1:如图（1），当PA⊥ 轴时，观察图形发现线段PA与PB的数量关系是__________； 小题2:当PA与 轴不垂直时，在图（2）中画出图形，线段PA与PB 的数量关系是否与（Ⅰ）所得结果相同？写出你的猜想并加以证明； 小题3: 为，线段PA=PB？此时∠POA的度数是多少，为什么？
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