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50cm=1/2*(4cm+2x+4cm)*4cm /*2
100 cm=(4cm+4x+4cm)*4cm
100cm=8cm+8x+8cm
100cm=16cm+8x
84cm=8x/:8
10,5cm=x
ob=2*7cm+2*4cm+2*10,5cm
ob=14cm+8cm+21cm
ob=43cm