Question

triangle congruence: sss and hl. triangle def is congruent to △def by the sss theorem. which single rigid transformation is required to map △def onto △def? dilation translation rotation reflection

Explanation:

A dilation is not a rigid - transformation. A translation moves a figure without rotating or reflecting it. A rotation turns a figure around a point. A reflection flips a figure over a line. Looking at the orientation of \(\triangle DEF\) and \(\triangle D'EF'\), we can see that a reflection is required to map one onto the other as the orientation is reversed.

Answer:

reflection