PQRS হল একটি বৃত্তীয় ট্রাপিজিয়াম যেখানে PQ হল SR এর সমান্তরাল এবং PQ হল ব্যাস। যদি ∠QPR = 40° হয়, তাহলে ∠PSR এর মান কত?

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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

প্রদত্ত:

PQRS হল একটি বৃত্তীয় ট্র্যাপিজিয়াম যেখানে PQ হল RS-এর সমান্তরাল।

PQ হল ব্যাস এবং ∠QPR = 40°

ধারণা:

একটি অর্ধবৃত্তে তৈরি কোণ একটি সমকোণ।

একটি বৃত্তীয় ট্র্যাপিজিয়ামের বিপরীত কোণের সমষ্টি হল 180°

গণনা:

ত্রিভুজ PQR-এ,

∠RPQ + ∠RQP + ∠QRP = 180° [কোণের সমষ্টির বৈশিষ্ট্য়]

⇒ 40° + ∠RQP + 90° = 180°

⇒ ∠RQP = 180° - 130° = 50°

∠RQP + ∠PSR = 180° [সম্পূরক কোণ]

∴ ∠PSR = 180° - 50° = 130°

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