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rotation 90 degrees counterclockwise about the origin

In the figure below, Triangle A has been rotated about the origin. Which Triangle shows a 90 degree

Write the coordinates of the vertices after a rotation 90 degrees counterclockwise around the origin. 1. L(1, 4) to L' 2. M(1,8) to M' 3. N(3,6) to N

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Rotating shapes about the origin by multiples of 90° (article)