PQRS एक चक्रीय समलंब चतुर्भुज है जहाँ PQ, SR के समांतर है और PQ व्यास है। यदि ∠QPR = 40° है, तो ∠PSR बराबर है:

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  1. 130°
  2. 120°
  3. 140°
  4. 110°

Answer (Detailed Solution Below)

Option 1 : 130°
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F1 Arun Madhuri 26.10.2021 D6

दिया गया है:

PQRS एक चक्रीय समलंब चतुर्भुज है जहाँ PQ, RS के समांतर है।

PQ व्यास है और ∠QPR = 40° 

संकल्पना:

अर्धवृत्त में बना कोण समकोण होता है।

एक चक्रीय समलंब चतुर्भुज के सम्मुख कोणों का योग 180° होता है।

गणना:

त्रिभुज PQR में,

∠RPQ + ∠RQP + ∠QRP = 180°  [कोण योग गुणधर्म

⇒ 40° + ∠RQP + 90° = 180° 

⇒ ∠RQP = 180° - 130° = 50° 

∠RQP + ∠PSR = 180° [संपूरक कोण]

∴ ∠PSR = 180° - 50° = 130° 

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