Triangles ABC and DEF are congruent. The length of the line segment AB is 5 yards, the length of the line segment BC is 7 yards, and the length of the line segment CA is 9 yards.

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To answer this question, we need to determine the lengths of the line segments DE, EF, and FD in congruent triangles ABC and DEF. Since triangles ABC and DEF are congruent, their corresponding sides are equal in length.

Given that the length of line segment AB is 5 yards, BC is 7 yards, and CA is 9 yards, we can conclude that the corresponding sides of DEF are also of the same length.

Therefore, the length of line segment DE in triangle DEF is 5 yards, the length of line segment EF is 7 yards, and the length of line segment FD is 9 yards.