સમચતુષ્કોણની ભ્રમણ સમમિતિનો ક્રમ શું છે? A. 1 B. 4 C. 2 D. 0

A rhombus looks the same after a rotation of 180° and 360° about its centre, i.e. twice in a full turn. So its order of rotational symmetry is 2.