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CBSE Class 7 Answered

The diameter of circular park is 24 m .A 3m wide part run around a firm inside Find the cost of paving the part at rupees 25 per square metre.
Asked by p.karuna1208 | 20 Nov, 2023, 12:25: PM
answered-by-expert Expert Answer
Diameter space of space the space circular space park equals 24 space straight m Radius space of space the space circular space park equals 12 space straight m Then comma space radius space of space the space inner space circular space park equals 12 space straight m space minus space 3 space straight m space equals space 9 space straight m Now comma space area space of space the space wide space part equals straight pi left parenthesis 12 right parenthesis squared minus straight pi left parenthesis 9 right parenthesis squared space equals 144 straight pi minus 81 straight pi equals 63 straight pi equals 63 cross times 22 over 7 equals 198 space straight m squared Cost space of space paving equals Rs.25 divided by straight m squared Therefore comma space cost space of space paving space 198 space straight m squared equals Rs.25 cross times 198 equals Rs.4950
Answered by Rashmi Khot | 20 Nov, 2023, 02:32: PM

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