वक्र के नाभिलंब की लम्बाई क्या है?

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Airforce Group X 7 November 2020 Memory Based Paper
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  1. 84 इकाई 
  2. 21 इकाई 
  3.  इकाई 
  4. 21/4 इकाई 

Answer (Detailed Solution Below)

Option 2 : 21 इकाई 
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संकल्पना:

केंद्र पर शीर्ष और X - अक्ष के साथ परवलय का समीकरण: y= 4ax,

नाभिलंब की लम्बाई = 4a

 

गणना:

परवलय का मानक रूप: y= 4ax          ....(1)

हमारे पास निम्न हैं,  

दिए गए समीकरण  की तुलना समीकरण (1) के साथ करने पर, हमें निम्न प्राप्त होता है,

4a = 21

∴ नाभिलंब की लम्बाई 21 इकाई है। 

अतः विकल्प (2) सही है।          

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