AB and CD are respectively the smallest and longest sides of a quadrilateral ABCD should that angle A>angle c and angle B>angle d
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construction-In first case draw a joining AC.
<ADB=<2,<DBA=<8
now, In triangle ADB
<2<><8. ----------------i
let <CDB=<1,<CBD=<7
<1><7. ------------------ii
adding both I and II
<2+<1><8+<7
<B><D
<ADB=<2,<DBA=<8
now, In triangle ADB
<2<><8. ----------------i
let <CDB=<1,<CBD=<7
<1><7. ------------------ii
adding both I and II
<2+<1><8+<7
<B><D
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