`I,I_(1),I_(2),I_(3)` are the in centre and excentres of `Delta ABC` .If `I(0,0),I_(1)(2,3),I_(2)(5,7)` then the, distance between the orthocentres of `Delta II_(1)I_(3)` and `Delta I_(1)I_(2)I_(3)" is`

If I_(1),I_(2),I_(3) and I are the excenter and incentres of Delta ABC respectively,then (II_(1))).(II_(2))*(II_(3))=

If I_(1),I_(2),I_(3) are excentres of the triangle with vertices (0,0),(5,12),(16,12) then the orthocentre of Delta I_(1)I_(2)I_(3) is

Delta I_(1)I_(2)I_(3) is an excentral triangle of an equilateral triangle Delta ABC such that I_(1)I_(2)=4 unit, if DeltaDEF is pedal triangle of DeltaABC , then (Ar(Delta I_(1)I_(2)I_(3)))/(Ar (DeltaDEF))=

If is the incentre of Delta ABC and I_(1) ,is the excentre opposite to the vertex.A' of Delta ABC, thern II_(1)=

The triangle formed by joining the three excentres I_(1),I_(2) and I_(3) of Delta ABC is called the excentral orexcentrictriangle and in this case interal angle bisector of triangle ABC are the altitudes of triangles I_(1)I_(2)I_(3) Incentre I of Delta ABC is the ......... of the excentral Delta I_(1)I_(2)I_(3).

If z_(1),z_(2),z_(3) are the vertices of triangle such that |z_(1)-i|=|z_(2)-i|=|z_(3)-i| and z_(1)+z_(2)=3i-z_(3) then area of triangle is

" If "z=((1+i)(1+2i)(1+3i))/((1-i)(2-i)(3-i))" then the principal argument of "z"