Y by Adventure10, Mango247
The triangles
and
are in the same plane. Between them, the following conditions hold:
(1) The midpoint of
is
,
(2) The points
and
are on the same line,
(3) There is a point
at which
and
intersect,
(4)
and
.
Show that if
then
.


(1) The midpoint of


(2) The points


(3) There is a point



(4)


Show that if

