The answer depends on how simple of complicated the shape is. For a reasonably simple shape, break it don into shapes such as triangles, parallelograms and trapezia, and circles or ellipses. Measure the dimensions of these shapes in feet and then, using standard formulae, calculate their areas - which will be in square feet. Add the results together to get the area of the shape.
For more complicated shapes you may need to approximate the area using the above shapes to approximately match the shape.
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Multiply by 144
Multiply the length times the width.
The area is 8*6 = 48 square feet
You figure out the square footage, and then the size and number of boards needed.
The first thing you will need to do is measure the square footage of the area. Once you know the square footage figure on average $50 per sq foot.