RRB Technician Grade 3 practice question
For a certain regular polygon, the sum of the interior angles works out to 2340°. Using this, find the measure of one exterior angle of the polygon.
From a RRB Technician Grade 3 Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (D) 24°
For any polygon with n sides, the sum of interior angles is (n−2)×180°. Here (n−2)×180° = 2340°, so n−2 = 13, giving n = 15. Since it is a regular polygon, its exterior angles are all equal and add up to 360°, so each exterior angle = 360°/15 = 24°. (Cross-check: interior angle = 180° − 24° = 156°, and 15 × 156° = 2340°, which matches the given sum.)
हिंदी में प्रश्न
किसी नियमित बहुभुज में अंतः कोणों का योग 2340° पाया जाता है। इसका उपयोग करके बहुभुज के एक बाह्य कोण का मान ज्ञात कीजिए।
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सही उत्तर: (D) 24°
n भुजाओं वाले किसी भी बहुभुज के अंतः कोणों का योग (n−2)×180° होता है। यहाँ (n−2)×180° = 2340°, अतः n−2 = 13, जिससे n = 15। चूँकि यह एक नियमित बहुभुज है, इसके सभी बाह्य कोण बराबर हैं और उनका योग 360° होता है, इसलिए प्रत्येक बाह्य कोण = 360°/15 = 24°। (जाँच: अंतः कोण = 180° − 24° = 156°, और 15 × 156° = 2340°, जो दिए गए योग से मेल खाता है।)
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