No. The number 7 does not have seven angles.
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An regular 8 sided octagon has no right angles unless it is shaped into an irregular octagon.
None or 2, depending upon the trapezium.
It varies depending on the angles and lines of the triangle.
It varies. If it has reflex angles, then it varies, depending on the number of reflex angles and their location in relation to each other. Otherwise (if it has no reflex angles) then it has 4 diagonals.
It has 3 acute angles. You can do this by multiplying however many sides it has by 2. I think this works. Try it with different shapes! Hope this helps!