25 సెం.మీ వ్యాసం కలిగిన వృత్తంలో 21 సెం.మీ పొడవు గల జ్యా గీసారు. కేంద్రం నుండి జ్యా యొక్క లంబ దూరం ఎంత?

This question was previously asked in
SSC CGL 2020 Tier-I Official Paper 1 (Held On : 13 Aug 2021 Shift 1)
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  1. √41
  2. √23
  3. √56
  4. √46

Answer (Detailed Solution Below)

Option 4 : √46
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Detailed Solution

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F1 Ashish Madhu 19.10.21 D3

ఇవ్వబడింది:

జ్యా = 21 సెం.మీ

వ్యాసం = 25 సెం.మీ

భావన:

జ్యాపై కేంద్రం నుండి లంబంగా గీసిన రేఖ, జ్యాను రెండు సమాన భాగాలుగా విభజిస్తుంది.

పైథాగరస్ సిద్ధాంతం:

OA2 = OD2 + AD2

గణన:

 AB అనేది జ్యా ,దీని  యొక్క పొడవు 21 సెం.మీ అనుకోండి.

⇒ OD అనేది లంబ దూరం

⇒ AO అనేది వృత్త వ్యాసార్థం

OA2 = OD2 + AD2

⇒ (25/2)2 = OD2 + (21/2)2

⇒ 625/4 = OD2 + 441/4 

⇒ OD2 = 625/4 - 441/4 = 184/4 = 46 

∴ OD = √46

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