16 .   I n   f i g u r e ,   A P   a n d   B P   a r e   tan g e n t s   t o   a   c i r c l e   w i t h   c e n t r e   O ,   s u c h   t h a t   A P = 5   c m   a n d   A P B = 60 ° . .   F i n d   t h e   l e n g t h   o f   t h e   c h o r d   A B .

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