Question
Download Solution PDFएक शंकु की त्रिज्या 5 सेमी और ऊंचाई 12 सेमी है। शंकु का वक्रपृष्ठीय क्षेत्रफल और इसके आधार के क्षेत्रफल का अनुपात ज्ञात कीजिये।
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UP Police Assistant Operator Memory Based Full Test 3
- 4 : 5
- 14 : 5
- 12 : 5
- 13 : 5
Answer (Detailed Solution Below)
Option 4 : 13 : 5
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Detailed Solution
Download Solution PDFदिया गया है:
शंकु की त्रिज्या = 5 सेमी
शंकु की ऊंचाई = 12 सेमी
सूत्र:
शंकु का वक्रपृष्ठीय क्षेत्रफल = πrl
शंकु के आधार का क्षेत्रफल = πr2
l2 = r2 + h2
गणना:
l2 = r2 + h2
⇒ l2 = 52 + 122
⇒ l2 = 25 + 144
⇒ l = √169
⇒ l = 13 सेमी
∴ अपेक्षित अनुपात = πrl : πr2
⇒ l : r
⇒ 13 : 5
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