To map triangle ΔABC to triangle ΔXYZ by translating first and then rotating, you should follow these steps:
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Translate triangle ΔABC so that vertex B coincides with vertex Z. This is necessary because the sides AB and XY are aligned and we want them to overlap correctly for the next step.
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Next, rotate triangle ΔABC about vertex B to align the sides and angles with triangle ΔXYZ.
So, the complete sentence would be:
"First, translate vertex B to vertex Z. Next, rotate ΔABC about B to align the sides and angles."