एक ΔABC में, D, E और F क्रमशः BC, CA और AB भुजाओं के मध्य बिंदु हैं। BE और DF एक दुसरे को X पर काटते हैं। DE और CF एक दुसरे को Y पर काटते हैं। XY का मान ज्ञात करें। 

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RRC Group D Previous Paper 3 (Held On: 19 Sep 2018 Shift 1)
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  1. BC/2
  2. BC/4
  3. 2BC/3
  4. BC/3

Answer (Detailed Solution Below)

Option 2 : BC/4
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Detailed Solution

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RRB Group-D 19th Sep 2018 Shift 1 26Q.docx 1

ΔABC में,

F, AB का मध्य बिंदु है और E, AC का मध्य बिंदु है।

∴ मध्य बिंदु प्रमेय के अनुसार,

EF ∥ BC

∴ EF ∥ BC      ----(1)

⇒ EF = BC/2       ----(2)

चूंकि D, BC का मध्य बिंदु है,

⇒ EF = BD       ----(3)

समीकरण 1 और 3 से,

⇒ BDEF एक समांतर चतुर्भुज है।

BE और DF एक दुसरे को X पर काटते हैं। 

इसी तरह, DCEF एक समांतर चतुर्भुज है।

DE और CF एक दुसरे को Y पर काटते हैं। 

∵ X और Y, क्रमशः DF और DE भुजाओं के मध्य बिंदु हैं।

ΔDEF में,

X, DF का मध्य बिंदु है और Y, DE का मध्य बिंदु है।

∴ मध्य बिंदु प्रमेय के अनुसार,

⇒ XY = EF/2       ----(4)

 From equation 3 and 4

 ⇒ XY = BC/4
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