Question

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

Explanation:

Dilation changes size, not a rigid - transformation. Rotation and translation do not seem to map the triangle as shown. A reflection across the line containing segment BC will map △ABC onto △A'BC' since the two triangles are mirror - images with respect to this line.

Answer:

B. reflection