a gardener wants to fence a circular garden of diameter 42 m. Find the length of the barbed wire he needs to purchase, if he makes 3 rounds of the fence.
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circumference of circular garden= 22/7×42
= 132cm
length of barbed wire need to purchase = 132×3
=396
= 132cm
length of barbed wire need to purchase = 132×3
=396
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