शंकूच्या आकाराच्या तंबूच्या पायाची त्रिज्या 9 मीटर आहे आणि त्याची उंची 12 मीटर आहे, जर त्याची किंमत ₹100 प्रति π चौमी असेल तर ते तयार करण्यासाठी आवश्यक सामग्रीची किंमत शोधा.

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RRB NTPC CBT 2 Level -6 Official paper (Held On: 9 May 2022 Shift 1)
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  1. ₹14,500
  2. ₹13,000
  3. ₹15,000
  4. ₹13,500

Answer (Detailed Solution Below)

Option 4 : ₹13,500
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
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Detailed Solution

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दिले आहे:

शंकूच्या आकाराच्या तंबूच्या पायाची त्रिज्या 9 मीटर आहे आणि त्याची उंची 12 मीटर आहे

वापरलेली संकल्पना:

शंकूचे वक्र पृष्ठभागाचे क्षेत्रफळ = π × त्रिज्या × तिरकी उंची

तिरकस उंची\(\sqrt{Radius^2 + Height^2}\)

गणना:

शंकूच्या आकाराच्या तंबूची तिरकी उंची\(\sqrt{12^2 + 9^2}\) = 15 सेमी

म्हणून, शंकूच्या आकाराचे तंबूचे वक्र पृष्ठभागाचे क्षेत्रफळ = π × 9 × 15 = 135π चौमी

अशा प्रकारे, सामग्रीची किंमत = (135π × 100) ÷ π = 13,500 रु.

सामग्रीची किंमत 13,500 रु.असेल.

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