The sides of the triangle will always meet at angles such that two of them will appear 'diagonal'. But these are not defined as diagonal lines.
There are actually no diagonals intersecting any triangle. Try drawing one and connecting the vertices - it doesn't work and you simply end up tracing over the lines that define the triangle.
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The only polygon with no diagonal is the triangle.
What you do is for example on a cube the lines are diagonal and on a normal square the line is strait! In every 3d shape or anything there is always a diagonal line.
Yes. Always