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The area of a rectangle is the length times the width. 3 is the length and 1 is the width, 3 times 1 is 3 so therefore the area is 3.
length is 30 width is 10
The width is half the length: The perimeter is twice the length plus twice the width. If the perimeter is 3 times the length, twice the width must be the length.
18 - 6 plus 3 times 2 how don't you know that ?
If you are after the volume, and the sides are all the same length, you take the length of one side and multiply it by itself three times (A cube has a side length of 3, what is it's volume? 3*3*3=27)