8m2 - 7n^2
- 15 m²+ 4n²
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Answer:
16 hectares=160000 sq.m.
40 dam=400 m
area of a triangle= 1/2 * base * height
160000=1/2*base*400
base=160000*2/400
=800 m
base=800 m= 80 dam
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