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help!! the assignment is on quadrilaterals, similar triangles, and circles! I really need this answered!

3) Consider AABD and AACD. Show that 2d > b + c – a where a = BC,b = AC,c = AB and d = AD.
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Transcribed Image Text

3) Consider AABD and AACD. Show that 2d > b + c – a where a = BC,b = AC,c = AB and d = AD.