you just times it by two
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no,we can divide the figure into squares,rectangles and triangles
To estimate area enclosed between the x-axis and a curve on a certain bounded region you can use rectangles or parallelograms.
They are the lines joining the opposite corners. To find them you will need to look for them!
Squares, circles, rectangles, trapeziums, hexagons, pentagons, octagons
You could consider the cross as two intersecting rectangles. Calculate the area of both rectangles and the area of the intersection (overlap). Then area of cross = sum of the areas of the rectangles minus the area of the overlap.