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यदि चतुर्भुज के अन्तः कोणों का अनुपात 3:4:5:6 हो, तो प्रत्येक कोण का मान ज्ञात कीजिए।

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माना चतुर्भुज के अन्तः कोण = 3x°, 4x°, 5x°, 6x

प्रश्नानुसार, 

3x° +4x° + 5x° + 6x° = 360°

⇒ 18x° = 360°

⇒ x° = 360°/18 = 20°

अतः चतुर्भुज के अन्तः कोण 3x° = 3×20° = 60°

⇒ 4x° = 4 x 20° = 80°

⇒ 5x = 5 x 20 = 100°

⇒ 6x° = 6x 20° = 120°

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