An L is two rectangles. Just make sure you only count the place where they intersect once.
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Circle = pi x radius squared Rectangle= l x w
Divide the room into two rectangles. Then calculate the area of each rectangle as length x width.
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.
It is to calculate the extent of the shape in 2-dimensional space.