RRB NTPC CBT-1 previous year question
The difference between the measure of an interior angle and an exterior angle of a regular polygon is 100°. What is the number of sides of the polygon?
Asked in RRB NTPC 2026 — 15 June Shift 2 · Quantitative Aptitude
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Correct answer: (C) 9
Let exterior angle = e, so interior angle = 180-e. Given (180-e)-e=100, so 180-2e=100, giving e=40°. Number of sides = 360/e = 360/40 = 9.
हिंदी में प्रश्न
एक सम बहुभुज के अंत: कोण और बाहा कोण के माप का अंतर 100 है। बहुभुज की भुजाओं की संख्या ज्ञात Pie!
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) 9
मान लें बाह्य कोण = e, तो अंतः कोण = 180-e। दिया गया है (180-e)-e=100, अतः 180-2e=100, जिससे e=40°। भुजाओं की संख्या = 360/e = 360/40 = 9 है।
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