note the tringle ABC is not isosceles with
the elevtions of AA1,BB1, and CC1.suppose
BA amd CA respectively point at BB1 and
CC1 so that A1BA is pependiculer to BB1
and A1CA perpendiculer to CC1.the read
and BC lines intersect at the TA point.
define in the same way TB and TC poits.
prove that TA,TB,and TC are collinear.
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