Step\\\\(1\\\\) Draw a line \\\\(l\\\\).Mark a point \\\\(A\\\\) on it.Step\\\\(2\\\\) Since length of \\\\(AB\\\\) is \\\\(7.8\\\\)cm, we measure \\\\(7.8\\\\)cm using ruler and compass.Step\\\\(3\\\\)Now keeping compass opened the same length.We keep pointed end at point \\\\(A\\\\), and draw an arc on line \\\\(l\\\\).So the required line segment is \\\\(\\bar{AB}=7.8\\\\)cmStep\\\\(4\\\\)Now, we need to cut of \\\\(AC\\\\) of length \\\\(4.7\\\\)cm.We measure \\\\(4.7\\\\)cm using ruler and compass.Step\\\\(5\\\\)Now keeping compass opened the same length.We keep pointed end at point \\\\(A\\\\), and draw an arc on line \\\\(l\\\\).Result:The required line segment \\\\(\\bar{AC}=4.7\\\\)cm