Question

triangle abc is congruent to △abc by the hl theorem. what single rigid transformation maps △abc onto △abc? dilation reflection rotation translation

Explanation:

A dilation changes the size of a figure, so it's not a rigid - transformation. A translation moves a figure without flipping or turning it. A rotation turns a figure around a point. A reflection flips a figure over a line. Looking at the congruent triangles, we can see that one triangle is the mirror - image of the other. So, a reflection is the single rigid transformation that maps one onto the other.

Answer:

B. reflection