Question

Theorem: The segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length.
A two column proof of the theorem is shown but the statement and reasons are not in correct order.




Statement
Reason
I
Segment DE is half the length of segment AC.
By substitution
II
Length of segment DE is and length of segment AC is .
By the distance formula
III
The coordinates of point D are (4, 5) and coordinates of point E are (5, 3)
By the midpoint formula
IV
Segment DE is parallel to segment AC.
Slopes of parallel lines are equal.
V
Slope

Answer 1

http://www.mathopenref.com/trianglemidsegment.html

Answer 2

can anyone me out ? ):