Answer :

Given: AB BO and NM OM


In ∆ABO and ∆NMO,


OBA = OMN


OB = OM …O is mid point of BM


BOA = MON …vertically opposite angles


Thus by AAS property of congruence,


∆ABO ∆NMO


Hence, we know that, corresponding parts of the congruent triangles are equal


AB = MN


Hence, we can calculate the width of the river by calculating MN


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