Well, it depends on the area of the shape you are trying to find, if its:
square: length times width
triangle: base times height divided by 2
circle: 3.14 times radius squared
trapezoid: base 1 plus base 2 times height divided by 2
A U shaped figure is probably half of a circle and a rectangle. The diameter of the circle is the same as the width of the rectangle.
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A star shaped figure is described as stellate. Also a hexagram
method usede to figure the volume of an irregular shaped object
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.
A circle perhaps
The remaining figure is the are of polygons that bounded by three dimensional figure .