圓心O（0,0）
則PO=√[（6-0）²+(-8=0)²]=10
r=5
所以PA=√（10²-5²）=5√3
過遠(yuǎn)X^2+Y^2=25外一點(diǎn)p(6-8),引圓的一條切線PA,A為切點(diǎn)
過遠(yuǎn)X^2+Y^2=25外一點(diǎn)p(6-8),引圓的一條切線PA,A為切點(diǎn)
求線段PA的長.
求線段PA的長.
數(shù)學(xué)人氣：871 ℃時間：2020-05-25 19:22:18
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