Yes. When you subtract two, you get two congruent sides.
It can have two congruent sides but does not have to.
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.
A trapezoid with two congruent, opposite sides is an isosceles trapezoid.
Yes a square has two congruent sides.
No congruent sides is a scalene, two congruent sides is an isosceles triangle, three is an equilateral.
Only if the congruent angle is the angle between the two congruent sides (SAS postulate).
An isosceles triangle has two congruent sides.
A parallelogram cannot have only two congruent sides, nor only two congruent angles.
A trapezoid will always have two parallel sides. However, it will not necessarily have two congruent sides. The only way it will have two congruent sides is if the angles at the base match.
Two of the sides of an iscosceles are congruent.
A parallelogram has two pairs of congruent sides.
Diamond