Answer :

bcalle
A = 1/2 * b * h
50 = 1/2 * b * 5
divide both sides by 5
10 = 1/2 * b
multiply 2 on both sides
20 = b
b = 20 km

CHECK
A = 1/2 * 20 * 5
A = 10 * 5
A = 50 km^2

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