The reason for statement 4 is " transitive property of congruence" which states that " If two segments (or angles) are each congruent to a third segment (or angle), then they're congruent to each other".
The reason for statement 4 is " transitive property of congruence" which states that " If two segments (or angles) are each congruent to a third segment (or angle), then they're congruent to each other".