Under the reflection, D goes to C and we do know that angle ADE is congruent to angle ACB. So the image of E is on CB as well as AB. Thus the image of E is B since B is the only point that satisfies both criteria.

Under the reflection, D goes to C and we do know that angle ADE is congruent to angle ACB. So the image of E is on CB as well as AB. Thus the image of E is B since B is the only point that satisfies both criteria.

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