Thứ Sáu, 12 tháng 9, 2014

40-Homothetic in tangential quadrilateral

Let ABCD be a tangential quadrialteral. O is circumcribed of ABCDE,F,G,H are projection of O to four sidelines. (tangent points of ABCD with (O)). The line perpendicular with Newton Line meet OE,OF,OG,OH at E_1,F_1,G_1,H_1R,S,T,U are intersection of four lines perpendicular with OE,OF,OG,OH at E_1,F_1,G_1,H_1. Then ABCD and RSTU are similar tangential quadrilateral, homothetic at V

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