Learn about the rules for 90 degree anticlockwise rotation about the origin.
How do you rotate a figure 90 degrees in anticlockwise direction on a graph?
Rotation of point through 90° about the origin in anticlockwise direction when point M (h, k) is rotated about the origin O through 90° in anticlockwise direction. The new position of point M (h, k) will become M' (-k, h).
Worked-out examples on 90° anticlockwise rotation about the origin:
1. Find the new position of the following points when
rotated through 90° anticlockwise about the origin.
(i) A (2, 3)
(ii) B (-5, -7)
(iii) C (-6, 9)
(iv) D (4, -8)
Solution:
When rotated through 90° about the origin in anticlockwise direction. The new positions of the above points are:
(i) The new position of point A (2, 3) will become A' (-3, 2)
(ii) The new position of point B (-5, -7) will become B' (7, -5)
(iii) The new position of point C (-6, 9) will become C' (-9, -6)
(iv) The new position of point D (4, -8) will become D' (8, 4)
2. Draw a triangle ABC on the graph paper. The co-ordinate of A, B and C being A (1, 2), B (3, 1) and C (2, -2), find the new position when the triangle is rotated through 90° anticlockwise about the origin.
Solution:
Plot the points A (1, 2), B (3, 1) and C (2, -2) on the graph paper. Join AB, BC and Cato get a triangle. On rotating it through 90° about the origin in anticlockwise direction, the new position of the points are:
A (1, 2) will become A' (-2, 1)
B (3, 1) will become B' (-1, 3)
C (2, -2) will become C' (2, 2)
Thus, the new position of ∆ ABC is ∆ A'B'C'.
● Related Concepts
● Order of Rotational Symmetry
● Reflection of a Point in x-axis
● Reflection of a Point in y-axis
● Reflection of a point in origin
● Rotation
● 90 Degree Clockwise Rotation
7th Grade Math Problems
8th Grade Math Practice
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