Question

Theorem: The segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length.

Answer 1

Answer:

Segment DE is half the length of segment AC. -- Substitution property of equality

Step-by-step explanation:

Here is given a proof for proving line joining mid segment is parallel and half the length of third side.

Stepwise proof is given in two columns

We find that for every line there is a justification as

STatement                                        Justification

D and E coordinates found out       MId point formula

DE and BC are measured                Distance formula

DE=1/2 BC                                          Substitution property of equality

This justification was missing in the given proof and with this included proof would be complete

Answer 2

Answer:

substitution property of equality

Step-by-step explanation:

i took the exam and got it right