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A grassy field has the shape of an equil...

A grassy field has the shape of an equilateral triangle of side 6m. A horse is tied to one of its vertices with a rope of length 4.2m. The percentage of the total area of the field which is available for grazing is best approximated by

A

0.5

B

0.55

C

0.59

D

0.62

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