ABC त्रिकोणाचा मध्यक AD तयार होतो आणि त्यावर लंब CF टाकला जातो. BE AD ला लंब आहे. BC = 34 सेमी आणि DF = 8 सेमी असल्यास, BE ची लांबी (सेमी मध्ये) किती आहे?

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  1. १७
  2. 9
  3. १५
  4. 19

Answer (Detailed Solution Below)

Option 3 : १५
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दिले:

BC = 34 सेमी

DF = 8 सेमी

वापरलेले सूत्र:

त्रिकोणामध्ये, मध्यक बाजूस दुभाजक करतो.

गणना:

F5 SSC Savita 12-8-24 D2

दिलेले BC = 34 सेमी

BED आणि CDF त्रिकोणामध्ये

BD = CD (कारण AD मध्य आहे)

∠E = ∠F

BDE = ∠CDF (अनुलंब विरुद्ध कोन)

म्हणून त्रिकोण BED आणि CDF एकरूप आहेत

म्हणून, BE = CF

त्रिकोणी बेडमध्ये:

(BD) 2 = (BE) 2 + (ED) 2

⇒ (17) 2 = (BE) 2 + (8) 2

⇒ २८९ = ६४ + (BE )

⇒ (BE ) 2 = 289 - 64

⇒ BE = \(\sqrt(225)\)

⇒ BE = 15 सेमी

अशा प्रकारे, BE ची लांबी 15 सें.मी.

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