Tamil Nadu Board of Secondary EducationSSLC (English Medium) (5 to 8) Class 7

The cost of decorating the circumference of a circular lawn of a house at the rate of ₹ 55 per metre is ₹ 16940. What is the radius of the lawn? - Mathematics

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Sum

The cost of decorating the circumference of a circular lawn of a house at the rate of ₹ 55 per metre is ₹ 16940. What is the radius of the lawn?

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Solution

Cost of decorating the circumference = ₹ 16,940

Cost of decorating per meter = ₹ 55

∴ Length of the circumference = `16940/55  "m"` = 308 m

Circumference of the circular lawn = 308 m

2 × πr = 308 m

`2 xx 22/7 xx "r"` = 308 m

r = `(308 xx 7)/(2 xx 22)`

r = 49 m

Radius of the lawn = 49 m

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Chapter 2: Measurements - Exercise 2.4 [Page 39]

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Tamil Nadu Board Samacheer Kalvi Class 7th Mathematics Term 2 Answers Guide
Chapter 2 Measurements
Exercise 2.4 | Q 4 | Page 39

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