如图：点P为∠AOB内一点，分别作出P点关于OA、OB的对称点P1，P2，连

如图：点P为∠AOB内一点，分别作出P点关于OA、OB的对称点P₁，P₂，连接P₁P₂交OA于M，交OB于N，P₁P₂=15，则△PMN的周长为；

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如图：点P为∠AOB内一点，分别作出P点关于OA、OB的对称点P1，P2，连

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