To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.
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There is no such formula. To determine the area of an irregular plane shape split it into known shapes such as rectangles, triangles, segments of a circle etc. Determine the area(s) of each of these and sum the results to find the total area.
The fact that there are 5 different values in the question suggests that the room is in the shape of an irregular pentagon. Such a shape can be tweaked into infinitely many configurations and so there is no way to determine its area.
Without knowing the shape of the garden, it is not possible to determine the area based solely on the perimeter. The area of a garden depends on its shape, whether it is rectangular, square, circular, or irregular.
You approximate the irregular shape with many small regular figure, for example, long and thin rectangles.
look it up in a math book