Try to decompose the figure into simple figures, for which formulae are known - such as triangles, rectangles, circular segments, etc.
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Not easily. You need to find the area or perimeter of the components and sum them.
Once you know the coordinates, you can use the distance formula to find the lengths of the sides, then using that, you can find the area.
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.
figures with the same volume does not have the same surface area.
Suppose you are asked to find the area of a rectangle that is 2.1- wide by 5.6- long. Your calculator answer would be 11.76 . Now suppose you are asked to enter the answer to two significant figures.