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are congruent equilateral triangles. Which of the following sides must be congruent to side AB?B D
BC, AC, PQ, PR and QR
Step 1: In an equilateral triangle all the three sides are equal.
Step 2: Each side of the ΔABC or ΔPQR is equal to all the other sides of two triangles.[Since ΔABC is congruent to ΔPQR.]
Step 3: So, the side AB is congruent to BC, AC, PQ, PR and QR.