midpoint
An Angle Bisector
Congruent line segments
triangular prism
I assume you mean 4 congruent sides or 2 pairs of congruent sides.. (There are no 4-sided figures with 8 sides.) A square.
Bisector
true
The equator - or the prime meridian.
midpoint
It could be the diameter of a circle that produces 2 congruent segments or the midpoint of a line segment
paperImproved Answer:-It has line symmetry
bisecting
the line of symmetry
Infinite ways
An Angle Bisector
mid-point
great circle