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Ex 6.4, 4 - ABCD is a quadrilateral. Is AB + BC + CD + DA > AC + BD?

Ex 6.4, 4 - Chapter 6 Class 7 Triangle and its Properties - Part 2

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Ex 6.4, 4 ABCD is a quadrilateral. Is AB + BC + CD + DA > AC + BD?In ∆ABD, Sum of two sides > Third side ⇒ AB + DA > BD Similarly, In ∆BCD, BC + CD > BD In ∆ACB, AB + BC > AC In ∆ACD, CD + DA > AC Adding (1), (2), (3), (4) AB + DA + BC + CD + AB + BC + CD + DA > BD + BD + AC + AC 2 (AB + BC + CD + DA) > 2 (AC + BD) (2 (𝐴𝐵 + 𝐵𝐶 + 𝐶𝐷 + 𝐷𝐴))/2 > (2 (𝐴𝐶+𝐵𝐷))/2 AB + BC + CD + DA > AC + BD Hence proved

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.