STATEMENT REASON
1. m3 = m 2 4
1.
2. Z2, Z3 are supplementary
2.
sides in
rays
3. m2 2 + m 2 3 = 180"
3. Definition of
agles
4. m2 2 + m 2 4 = 180°
4. Substitution
5. m 2 1 = m 2 4
5. Opposite
are
6. m2 + m Z1 = 180°
6.
7. 21,2 2 are supplementary
7. Definition of
angles

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daren is correct because

the diagram shows you   triangle def with de=4, df=9 and de≠df≠ef.

the sum of the lengths of two triangles' sides are always greater than the length of the third side:

substitute sides lengths:

then 5< ef< 13 (option 3 is true).

def is a scalene triangle with all sides of different lengths (option 5 is true, option 2 is false).

answer: correct choices are 1, 3 and 5