RRB Technician Grade 3 previous year question
If an exterior angle of a regular polygon is 40°, then find the number of diagonals of the polygon.
Asked in RRB Technician Grade 3 (10 Mar 2026 Shift 1) · Quantitative Aptitude
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Correct answer: (A) 27
An exterior angle of 40° means the polygon has 360°/40° = 9 sides. The number of diagonals of an n-sided polygon is n(n−3)/2 = 9×6/2 = 27.
हिंदी में प्रश्न
यदि किसी समबहुभुज का एक बाह्य कोण 40° है, तो बहुभुज के विकर्णों की संख्या ज्ञात कीजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 27
40° का बाह्य कोण दर्शाता है कि बहुभुज की भुजाएं = 360°/40° = 9 हैं। n भुजाओं वाले बहुभुज में विकर्णों की संख्या n(n−3)/2 = 9×6/2 = 27 होती है।
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