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Step-by-step explanation:
76-a- 1m²=100cm²
0.8m²=0.8×100cm²=80cm².
b- 100cm³=1m³
8500cm³=8500/100m³=85m³
77-a- Perimeter of Rectangle = 2(Length+Breadth)
perimeter = 2(50m+23m)=146m.
b- Area of Rectangle = L×B
Area= 50 × 23 = 1150m².
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