"Let's\\;calculate\\;area\\;of\\;lateral\\;faces.\\\\S_{l.f.}=P\\times h=(20+20+20)\\times4=240\\;cm^2\\\\Next,\\\\S_{bases}=173\\times2=346\\;cm^2\\\\Total\\;Area\\;=\\;346\\;+\\;240\\;=\\;586\\;cm^2\\\\"
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