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[" 4.In the adjoining figure,"ABCD" is a...

[" 4.In the adjoining figure,"ABCD" is a "],[" parallelogram in which "/_A=60^(@)" .If the "],[" bisectors of "/_A" and "/_B" meet "DC" at "P" ,"],[" prove that (i) "/_APB=90^(@)," (ii) "AD=DP" and "],[PB=PC=BC," (iii) "DC=2AD]

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