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यदि चतुर्भुज के तीन बाह्य कोण क्रमशः 80°,100° और 120° हों, तो चौथे अन्तः कोण का मान ज्ञात कीजिए।

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चतुर्भुज के तीन अन्तः कोण = 80°, 100° व 120°

माना चतुर्भुज का चौथा अन्तः कोण = x°

प्रश्नानुसार,

80° + 100° + 120° + x° = 360°

⇒ 300° + x° = 360°

⇒ x° = 360° -300°

⇒ x° = 60°

अतः चौथे अन्तः कोण का मान = 60° है।

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