Mathematics
Find the co-ordinates of the points obtained on rotating the following points through 90° about origin in the anticlockwise direction:
(i) (4, 6)
(ii) (4, -6)
(iii) (-4, 6)
(iv) (-4, -6)
(v) (0, 6)
Symmetry
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Answer
(i) When a point P(x, y) is rotated through 90° (anticlockwise) about the origin O, we get the point P' = (-y, x).
For the point (4, 6) in axis = (-6, 4).
(ii) When a point P(x, y) is rotated through 90° (anticlockwise) about the origin O, we get the point P' = (-y, x).
For the point (4, - 6), after rotation, the new coordinates become (6, 4).
(iii) When a point P(x, y) is rotated through 90° (anticlockwise) about the origin O, we get the point P' = (-y, x).
For the point (-4, 6), after rotation, the new coordinates become (-6, -4).
(iv) When a point P(x, y) is rotated through 90° (anticlockwise) about the origin O, we get the point P' = (-y, x).
For the point (-4, -6), after rotation, the new coordinates become (6, -4).
(v) When a point P(x, y) is rotated through 90° (anticlockwise) about the origin O, we get the point P' = (-y, x).
For the point (0, 6), after rotation, the new coordinates become (-6, 0).
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