The goal is to show that if triangle abc is similar to triangle a'b'c' and triangle a'b'c' is similar to triangle a''b''c'', then triangle abc is similar to triangle a"b"c". symbolically, if triangle abc~triangle a'b'c' and triangle a'b'c' ~a"b"c", then triangle abc~triangle a"b"c". describethat proves trianhle abc ~ triangle a'b'c'.