In principle, you can - here, for example, a job where graphene fragments are stitched together with a laser. However, no one does that. If a large graphene sheet is needed, CVD should be used - here's a recent overview.
Not by area, but by thickness. Graphene is obtained by exfoliation from graphite, you can connect these pieces to each other, but you cannot overlap each other. Graphene is 1 atom thick, since it is a two-dimensional compound of pentagonal carbon cells. When these structures are superimposed on each other, graphite is obtained. All I knew answered.