a triangle that has at least two equal sides

a triangle that has at least two sides which are congruent (equal)

a triangle that has two sides that are equal

a triangle with two equal angles

An isosceles triangle is any triangle with two equal sides.

A triangle with at least two congruent angles.

A triangle with two equal sides.

a triangle that contains at least two sides of equal length

a triangle with two congruent sides and two congruent angles.

Triangle with two congruent sides. L's

A triangle that has exactly two congruent sides.

A triangle that has at least two congruent sides.

(4) A triangle in which two of the three sides are the same length.

a triangle that has two sides the same length (and two angles the same).

a triangle that has two equal (congruent) sides and two equal angles.