आयताचे कर्ण 25° वर आयताच्या एका बाजूला झुकलेले असतात. कर्णांच्या दरम्यान बनलेला लघुकोन पुढीलप्रमाणे आहे:

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RRC Group D Previous Paper 6 (Held On: 24 Sep 2018 Shift 1)
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  1. 25°
  2. 50°
  3. 55°
  4. 40°

Answer (Detailed Solution Below)

Option 2 : 50°
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आकृती:

AL

गणना:

जसे आयताचे कर्ण एकमेकांना छेदतात,

⇒ AO = OB

⇒ ∠OBA = ∠OAB = 25° [∵ समान बाजूच्या विरुद्ध कोन समान आहेत]

ΔAOB मधील कोनाच्या बेरीज गुणधर्मानुसार,

⇒ ∠AOB + ∠OAB + ∠OBA = 180°

⇒ ∠AOB + 25° + 25° = 180°

⇒ ∠AOB = 130°

रेखीय जोडी गुणधर्मानुसार,

⇒ ∠DOA + ∠AOB = 180°

⇒ ∠DOA + 130° = 180°

⇒ ∠DOA = 50°

∴ दोन्ही कर्ण एकमेकांना 50° कोन करतात.
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