Question

the cost of levelling the ground of circular region at a rate of Rs.2 per square meter is Rs.4928. Find the radius of the ground

Answer 1

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We know that ,

Total Cost of levelling = Rate × Area of region

4928 = 2 × Area of region

4928 / 2 = Area of region

Area of region= 2464sq .m

Thus ,
Area of circular region is 2464sq .m

We know that ,
Area of circle = πr^2

2464 = 22 / 7 × r^2

2464 × 7 = 22 × r^2

17248 = 22r^2

17248 / 22 = r^2

784 = r^2

r = √784

r = 28m
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Thus , The radius of the ground is 28m.
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hope this helps !

Answer 2

Answer:

4928 = 2 × Area of region

4928 / 2 = Area of region

Area of region= 2464sq .m

Thus ,

Area of circular region is 2464sq .m

Step-by-step explanation: