You multiply the length times the width of the shape.
LxW=A
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the area is 18
area is inside and and perimeter is outline.
Calculate the area of the shape. The formula to be used will be different for different shapes.
To calculate the surface area of a shape find the area of each side, and then, add all of the areas together. The sum of the areas is the surface area.
If the area is that of a circle or a regular polygon (triangle, square, reg pentagon etc) there are formulae that will enable you to do so. If it is any other shape - ellipse, irregular polygon, or worse still a random shape - then the area cannot be found.