I have to rotate a point 90 degress but I don't know how?
There has to be a centre about which to rotate. If the centre is the origin, and you know the coordinates of the point, then (a, b) becomes (-b,a)
for example (3,4) becomes (-4,3)
otherwise, join the centre of rotation to your point to get a line. Use your protractor to measure 90 degrees clockwise/anticlockwie and make the length of the new line the same as the original.
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