Final answer:
To measure the lengths of the sides of a triangle, use a ruler or a measuring tape. The lengths of the sides of the coinciding triangles will be the same.
Step-by-step explanation:
To measure the lengths of the sides of triangle ABC, you can use a ruler or a measuring tape. Measure side AB, side BC, and side CA. Record the measurements. To measure the lengths of the sides of triangle A'B'C' when it coincides with triangle ABC, you can simply use the same measurements. The lengths of the sides will remain the same.