Question

Prove: The segment joining the midpoints of two sides of a triangle is parallel to the third side.

Answer 1

I can't tell you the eaxct rule that proves this but you end up with a similar triangle. One angle definitively stays the same and two of the sides are scaled by half. It's something to do with SAS.

Answer 2

use the alternate interior angle theorem

Answer 3

http://www.mnstate.edu/peil/geometry/C2EuclidNonEuclid/6ExteriorAngleR.htm

this problem is similar to what ur trying to find out

Answer 4

hope it helps!!