What letter is made with 2 diagonal lines? i ask it because
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'2' . From opposite corners.
A diagonal line of a polygon is a line that joins any two vertices not already joined by a side. A polygon with n sides has n(n-3)/2 diagonals → an octagon has 8(8-3)/2 = 8 × 5 ÷ 2 = 20 diagonals
It has 2
Well a parallelogram is a 4 sided shape with 2 pairs of parallel lines, hence PARALLELogram. That's the reason, because there are two pairs of parallel lines.
Not necessarily. If the sides are a multiple of sqrt(2) units, then the diagonal is rational.