MATHEMATICS Fig 14.13 (i) is the initial position. Rotation by 90° about the centre leads to Fig 14.13 (ii). Note the position of P now. Rotate again through 90° and you get Fig 14.13 (iii). In this way, when you complete four quarter-turns, the square reaches its original position. It now looks the same as Fig14.13 (i). This can be seen with the help of the positions taken by P. Thus a square has a rotational symmetry of order 4 about its centre. Observe that in this case, (i) The centre of rotation is the centre of the square. (ii) The angle of rotation is 90°. (iii) The direction of rotation is clockwise. (iv) The order of rotational symmetry is 4.

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