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Answer:
I think it should be
4m
Step-by-step explanation:
area of triangle=1/2× b×h
10m^2=1/2×b×5m
10m^2=5m×b/2
now do cross multiply
20m^2=5m×b
20m^2÷5m=b
4m=b
so, b is 4m
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