Question

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

Explanation:

A reflection is a rigid - transformation that flips a figure over a line. Dilation is not a rigid - transformation as it changes the size of the figure. Rotation turns a figure around a point, and translation slides a figure. Observing the orientation of the two congruent triangles, a reflection over a line passing through point E and perpendicular to the line segment joining D and D' would map △DEF onto △D'EF'.

Answer:

reflection