Question

Gardner want to fence a circular garden of diameter 21 metre find the length of the wire he needs to purchase and cost of it at rupees 4 per metre

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Answer 1

The cost of wire to purchase is Rs 264.

Explanation:

Given,

The diameter of the circular garden is 21 m

The radius(r) =
`(21)/(2)` m

To find, the length of wire of the fence we need to find the circumference.

Formula

The circumference of the circle = 2πr meter

=2×
`(22)/(7)` ×
`(21)/(2)` m

=66 meter

So, the length of the wire = 66 m

The cost of wire Rs 4 per meter.

The total cost = Rs 4 × 66

= Rs 264