Measurement of antinuclear antibodies (ANAs) in serum is the most commonly performed screening test for patients suspected of having a systemic rheumatic disease, also referred to as connective tissue disease.(1) ANAs occur in patients with a variety of autoimmune diseases, both systemic and organ-specific.
How do you rotate a figure 180 degrees in anticlockwise or clockwise direction on a graph? Rotation of a point through 180Â°, about the origin when a point M (h, k) is rotated about the origin O through 180Â° in anticlockwise or clockwise direction, it takes the new position M' (-h, -k).Worked-out examples on 180 degree rotation about the origin:n plotting the points P (-3, 1) and Q (2, 3) on the graph paper to get the line segment PQ. Now rotate PQ through 180Â° about the origin O in anticlockwise direction, the new position of points P and Q is: P (-3, 1) â P' (3, -1). Q (2, 3) â Q' (-2, -3). Thus, the new position of line segment PQ is P'Q'.
Thus we say that after the rotation of 180 degrees, the given figure take the position of rotational symmetry. Furthermore, if figure is again rotated by 180 degrees, it again comes in the original form. Thus, we conclude that rotational symmetry of rhombus is at 180 degrees and at 360 degrees. Thus we say that the order of symmetry of rhombus is 2. In case of rhombus, we find that the order of rotation of figure is 2. Therefore, the angle of rotational symmetry = 360 / order of symmetry. = 360 / 2 = 180 degrees. It means that after the rotation of every 180 degrees, the rhombus will take its original shape.