"Figure" can be a written symbol of a number ora diagramora geometrical shape.It is also used as a word in place of "calculate".
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A plane figure has 2 dimensions (length & width$ & is represented by a flat surface. It takes 3 noncollinear points to make a plane. A solid figure has 3 dimensions. It not only has length...
Partition it into simple shapes and work out their areas. Then add together all the components.
You get the area by using formulas. There is usually a specific formula to find the area of each shape. Some irregular shaps may not have a formula.