A line segment:
In a cartesian plane
triangle ABC IS RIGHT ANGLED AT B
POINT C IS LOCATED ON THE X AXIS ( , 0)
POINT D IS ON LINE SEGMENT BA
mBD = m DA

I know the midpoint of point a(72,54) & B
(0,36) is( 36,45), i need to know the other point which is located on the x axis which automatically becomes ( , 0) So one point is (36,35) but i need to get the x coordinate on the other one. How do i do that?? Please help

Question

A line segment:
In a cartesian plane
triangle ABC IS RIGHT ANGLED AT B
POINT C IS LOCATED ON THE X AXIS ( , 0)
POINT D IS ON LINE SEGMENT BA
mBD = m DA

I know the midpoint of point a(72,54) & B
(0,36) is( 36,45), i need to know the other point which is located on the x axis which automatically becomes ( , 0) So one point is (36,35) but i need to get the x coordinate on the other one. How do i do that?? Please help