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A Gardener Wants to Fence a Circular Garden of Diameter 21 M. Find the Length of the Rope He Needs to Purchase, If He Makes 2 Rounds of Fence. Also Find the Costs of the Rope, If It Cost Rs 4 per Meter - Mathematics

A gardener wants to fence a circular garden of diameter 21 m. Find the length of the rope he needs to purchase, if he makes 2 rounds of fence. Also find the costs of the rope, if it cost Rs 4 per meter (Take `pi = 22/7`)

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Solution

d = 21 m

r = 21/2  m

Circumference = `2πr = 2 xx 22/7 xx 21/2` = 66 m

Length of rope required for fencing = 2 × 66 m = 132 m

Cost of 1 m rope = Rs 4

Cost of 132 m rope = 4 × 132 = Rs 528

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APPEARS IN

NCERT Class 7 Maths
Chapter 11 Perimeter and Area
Exercise 11.3 | Q 4 | Page 223
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