2.
过\(\triangle ABC\)所在平面\(\alpha \)外一点\(P\),作\(PO\bot \alpha \),垂足为\(O\),连接\(PA\),\(PB\),\(PC\),则下列说法中正确的是
___________\(.(\)将所有正确说法的序号填写在横线上\()\)
\(①\)若\(PA=PB=PC\)
,则点\(O\)
为\(\triangle \)\(ABC\)
的重心; \(②\)若\(PA=PB=PC\)
,\(\angle C={{90}^{\circ }}\)
,则点\(O\)
为\(AB\)
边的中点; \(③\)若\(PA\bot PB\)
,\(PB\bot PC\)
,\(PC\bot PA\)
,则点\(O\)
为\(\triangle \)\(ABC\)
的垂心; \(④\)若\(PA\bot PB\)
,\(PB\bot PC\)
,\(PC\bot PA\)
,\(AB=BC=CA\)
,则\(O\)
为\(\triangle \)\(ABC\)
的外心; \(⑤\)若点\(P\)到三条直线\(AB\),\(BC\),\(CA\)的距离全相等,则点\(O\)为\(\triangle \)\(ABC\)的内心.