20. A field in the shape of an equilateral triangle with side 225 m is fenced with three rounds of rope. Another field, rectangular in shape, of length 200 m and breadth 125 m is fenced with two rounds of rope. Which field requires more rope and by how much?
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Perimeter of equilateral triangle =3×225
=675m
Three rounds of rope, therefore length of rope=3×675=2025
Perimeter of rectangular field=2(l+b)
=2(200+125)
=2×325
=650m
Two rounds of rope, therefore length of rope =2×650=1300m
Difference of length of ropes=2025-1300
=725m
Hence triangular field requires more rope by 725m
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