Criteria to choose between clockwise and anticlockwise rotation of

Hi guys, I come to seek some knowledge. I have a couple of lines pointing towards a center, and I need to rotate them so that they face the white direction. This rotation must be according to the least rotation possible. I was not able to think of an appropriate criteria to use. I thought about comparing Angle and Reflex angle, but it is not enough: In the picture you can see that both reflex angles (blue) are larger than the actual angle (red), but the line in the upper corner needs to be

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90 Degree Anticlockwise Rotation Rotation of Point through 90° about the Origin

SOLUTION: Q is the rotation of P(8,1) counter clockwise through 90* about the origin O, i.e. OP=OQ and angle QOP=90*. R Is the reflection of Q in the line y=x. S is

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