Respuesta :

Answer:

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Step-by-step explanation:

Answer:

detail in steps

Step-by-step explanation:

as illustrated

AB = AP + BP

CD = CR + DR

AD = AS + DS

BC = BQ + CQ

while AP = AS   BP = BQ    CQ = CR    DR = DS

AB + CD = AP + BP + CR + DR

AD+BC =  AS + DS + BQ + CQ

∴ AB+CD=AD+BC

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