You should break it down in to smaller shapes. Two rectangles. Then figure out all the lengths. Multiply to find the area of the two rectangles. then add the products to get the final area.
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By dividing it into two rectangles.
A rectangle that is 2cm by 4cm has an area of 8cm. It also has a perimeter of 12cm.
room is in cuboid shape, so by calculating length(L),breadth(B),height(H) we can find area by formula AREA=L*B*H
That is the definition of the area of a rectangle. It does not work for any other shape.
you can do a rectangle: 7x3=21. hope it helps! :D