Maharashtra State BoardSSC (English Medium) 7th Standard

The Radius of a Circular Garden is 56 M. What Would It Cost to Put a 4-round Fence Around this Garden at a Rate of 40 Rupees per Metre? - Mathematics

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Sum

The radius of a circular garden is 56 m. What would it cost to put a 4-round fence around this garden at a rate of 40 rupees per metre?

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Solution

Radius of the circular garden, r = 56 m
Circumference of the circular garden, c = 2πr
= `2xx22/7xx56`
= 352 m
∴ Length of the wire needed for one round of fencing = c = 352 m
Cost of one round of fencing = length of wire × cost per metre
= 352 × 40
= 14080 rupees
Cost of four round of fencing = 4 × 14080 = 56320 rupees

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Chapter 11: Circle - Practice Set 42 [Page 77]

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Balbharati Mathematics 7th Standard Maharashtra State Board
Chapter 11 Circle
Practice Set 42 | Q 3 | Page 77

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