Area of rectangle = length * width = 9*8 = 72 metres2
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40m
Isn't it the sum of all sides? 8m+8m+3m+3m = 22m
If you put an ant down on the rectangle and start him walking along the line, the 'perimeter' is the distance he has to walk in order to get back to where he started, if he stays on the line. If you put him down on a corner of this one, he has to walk (8m + 3m + 8m + 3m) = 22m. That's the perimeter.
224 m to the 3rd power
8*4*5 = 160 cubic metres.