Width x Length for every face of the figure. Then add them all up.
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A(5) = 4 25
You multiply the length and the width of the room
If you know the dimensions of the missing triangle, then compute the area from those dimensions, then subtract that answer from the area of the full rectangle.
Kinda of a combination of both. The surface of a 3-D object is called surface area.
surface area is basically the total area of each surface of the 3d object. Sa = 2-D A = 3-D