Question

$\triangle abc$ maps onto $\triangle edc$ after a rotation of $180^\circ$ about point c.

1. $\angle a$ corresponds to *

$\angle b$
$\angle c$
$\angle d$
$\angle e$

Explanation:

A 180° rotation about point C maps △ABC to △EDC, meaning corresponding angles match the vertex order of the congruent triangles. ∠A is the first vertex of △ABC, so it corresponds to the first vertex of △EDC, which is ∠E.

Answer:

∠E