△XWV and △ZWU are congruent by the SAS Congruency rule.
We are given two triangles, △XWV and △ZWU
The line segment VW is congruent with line segment UW
That is VW = UW
And ∠X = ∠Z
The sides corresponding to the equal angles are also equal,
So, XV = ZU
Thus, △XWV and △ZWU are congruent by the SAS Congruency rule, in which two sides and an angle are equal to equal other which makes the two triangles congruent.
The corresponding sides of the congruent triangles are always equal.
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