The rotation matrix for a 90° rotation is [[0,-1],[1,0]]
More simply, if our shape is a function of x and y, we swap x and y and then negate y.
For instance: if our function is y=x, then the 90° rotation would be x=-y
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Rotating a figure 270 degrees is like rotating the figure to the left 90 degrees. I am not sure what formula or rule you use. *Joe Jonas Rocks*
A Right Isosceles Triangle is a shape that has one 90° angle. 90 degrees + the other two angles add up to 180 degrees.
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It is a right angle
L shape