HOW DO YOU ROTATE A POINT?

Mathematics
Tutor: None Selected Time limit: 1 Day

I have to rotate a point 90 degress but I don't know how?

Nov 13th, 2014

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.  

Nov 13th, 2014

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Nov 13th, 2014
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