So basically what you have done is count the squares and calculated the area's I have modified the image and added color ( Red,Black and blue) so
Black has 4*2*1/2
Red has 4*3*1/2
Blue has 2*1*1/2
is this correct and then subtract from the total?
image modified.png [ 21.29 KiB | Viewed 298 times ]
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