Angles with the same measure.
Examples
The four angles of a square are congruent, as they all measure 90°.
The four angles of a rectangle are congruent, as they all measure 90°.
The opposite angles of a rhombus are congruent.
The four angles of a square are congruent, as they all measure 90°.
The four angles of a rectangle are congruent, as they all measure 90°.
The opposite angles of a rhombus are congruent.