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20 10 a question about the simulation test of the senior high school entrance examination in Pudong New Area
1 . y = 12/(x+4)； X>0. Think about it, what is an "extension" line?

2.△APQ =△AEQ+△PEQ = y×4+y×x = y×(x+4)= 12。

3.△APQ=AP×4/2= 12，AP=6。 BP=√27，AE/AP=BC/BP，x/6=4/√27，AE=8/√3，AQ=AE，

⊙A =8/√3-4 radius.

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