Question

6. ABCD is a quadrilateral.
Prove that (AB + BC + CD + DA) > (AC + BD)



7. If O is a point in the exterior of ABC, show that
2(0A + OB +OC) > (AB + BC + CA).
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Answer 1

Ab + Ac

Oa + oc this is solution of this question and this is the steps of quadrilateral