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18/12 = 3 : 2 or 1.5 : 1 or one and a half to one.
To get the area it half breadth by height. A simplified thought on this is because the formula for the area of a parallelogram is length by width, and a triangle would be half of this
breadth
Breathe or breadth?
The breadth of my foot is 3 inches.
Breadth: in this sense means width.