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If the sides ab,bc,cd,da of a quadrilateral abcd are in descending order of magnitude show that angle cda > angle cba

Please help me with question 15. I have applied triangle inequality to every side possible but can't get a good equation.

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closed as off-topic by A. Goodier, Claude Leibovici, Strants, Ethan Bolker, José Carlos Santos Feb 28 '18 at 22:41

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – A. Goodier, Claude Leibovici, Strants, Ethan Bolker, José Carlos Santos
If this question can be reworded to fit the rules in the help center, please edit the question.

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This image seems to present a counterexample...

enter image description here

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