"No congruent sides" means: a polygon or prism that has no two sides that are exactly alike.
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I assume you mean 4 congruent sides or 2 pairs of congruent sides.. (There are no 4-sided figures with 8 sides.) A square.
It has four congruent sides.
A parallelogram has two pairs of congruent sides, and the opposite sides are congruent.
No. A rectangle has opposite sides congruent. If consecutive sides are also congruent, then your rectangle is a square.
A triangle with two congruent sides is an isoscelestriangle. But an equilateral triangle has two congruent sides. (It actually has three congruent sides.) And isosceles triangle is generally described as a triangle with exactly two congruent sides.