Yes. Simply take a square with one and add the same number to each one of the numbers in it.
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2 sets of parallel lines make up a square. One set is composed of vertical lines, the other of horizontal ones.
Four ones make 4 and three ones make 3... and forty-three ones make 43.
They can be any shape ! We have square and rectangular ones in my town (and there's at least a couple of triangular ones too !)
One big square or lots of little ones.
In mathematics, these are a few geometrical formulas that are very simple:Perimeter of square: 4sPerimeter of rectangle: 2(a+b)Area of square: s2Area of rectangle: abThe term 'easiest' is very comparative, so it is possible that the 'easiest formula' isn't the ones listed.