(i) the same length ( to be congruent to each other the length of two line segment should be equal.)
(ii) the same measure (To be congruent to each other the measure of two angles should be equal.)
(iii) the same side length (To be congruent to each other the side of two squares should be equal.)
(iv) the same radius (To be congruent to each other the radius of two circles should be equal.)
(v) the same length and the same breadth (To be congruent to each other the length and breadth of two rectangles should be equal.)
(vi) equal parts (To be congruent to each other the three angles and three sides of two triangles should be equal.)