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Mathematics problems of Hebei teaching printing plate in the second day of junior high school
Congruent triangles method can be constructed.

Choose a point o at one end of the pond, connect AO and BO, and extend to c and d, so OC=OA and OD=OB.

Because angle AOB= angle COD, triangle COD is congruent with triangle AOB, and CD=AB.

Measuring the distance of CD is the distance between two villages in AB.