Posted by **Ariel** on Thursday, June 10, 2010 at 8:55am.

An isosceles triangle Î”ABC has its altitude at the y-axis and its base at the x-axis. D is the midpoint of segment AC and E is the midpoint of segment CB. Given the coordinates A(-2a, 0), B(2a, 0), and C(0, 2b), determine the coordinates of midpoints D and E.

a.)D(2a,-b); E(-a,b)

b.)D(-a,b); E(a,b)

c.)D(0,2b); E(2a,0)