I'm not sure what it actually is but have a look at the movie Donald in Mathmagic Land. It helps a lot
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Yes, if you're talking about a rectangle
Suppose the width=x so the length will be= (2x+3) Now perimeter of rectangle = 2(length+width) so, 186=2(x+2x+3) or, 3x+3=93 or, 3x=90 so, x=30 so the width of the rectangle is 30meters
Area of rectangle divided by its length = width of rectangle
lenghth X width
in finding the area if a square or rectangle multiply the length and width, for a triangle, multiply length and width divided by two.