The proof does the fourth statement and reason represent It is an argument.
AB≅ BC and BC≅EF
a = b and b = c then, a =c
ABC is the side of the triangle
⇒AB≅EF
AB = EF [def of segment]
By Segment Addition Postulate states that given two points A and C, and a third point B lies on the line segment AC if and only if the distances between the points satisfy the equation
AB + BC = AC.
Since, the line segment EG, F lies on the line segment;
then, by segment addition postulates we have;
EG = EF + FG
By substitution AB=EF
⇒ EG = AB + FG hence proved!
In the fourth statement, the reason is: It is an argument.
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