Chop it into 4 equal sections (quarters)
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2 pairs of congruent line segment
Only the square has.
A square
no triangle do not have four congruent angles
Given that an octogon has eight sides, then the simplest way would be to enscribe a circle. Divide it exactly in half, then divide it in half again, at right angles to your first line.You now have four quarters. Divide each quarter in half, and you will have eight segments. Connect the points of the segments and you will have an octogon.