उजव्या गोलाकार वृत्तचीतीची त्रिज्या आणि उंचीमध्ये काय फरक आहे ज्याच्या वक्र पृष्ठभागाचे क्षेत्रफळ 352 सेमीआणि घनफळ 1408 सेमी3 आहे?

  1. 3 सेमी
  2. 2 सेमी
  3. 1 सेमी
  4. 4 सेमी

Answer (Detailed Solution Below)

Option 3 : 1 सेमी
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Detailed Solution

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दिलेले आहे:

उजवी गोलाकार वृत्तचीती: वक्र पृष्ठभागाचे क्षेत्रफळ 352 सेमीआणि घनफळ 1408 सेमी3

वापरलेले सूत्र:

वृत्तचितीच्या वक्र पृष्ठभागाचे क्षेत्रफळ = 2πrh

वृत्तचितीचे घनफळ = πr2h

पडताळा:

वृत्तचितीची त्रिज्या आणि उंची अनुक्रमे ‘r’ आणि ‘h’ मानू

सूत्र वापरून:

वृत्तचितीच्या वक्र पृष्ठभागाचे क्षेत्रफळ = 352

⇒ 2πrh = 352

⇒ rh = 56     ----(1)

आणि

वृत्तचितीचे घनफळ = 1408

⇒ πr2h = 1408

⇒ πr × rh = 1408

समीकरण 1 मधून:

⇒ 22/7 × r × 56 = 1408

⇒ r = 8

आता, समीकरण 1 मधून:

⇒ h = 56/8 = 7

∴ त्रिज्या आणि उंचीमधील फरक = 8 – 7 = 1 सेमी
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