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She turned 360-a degrees, 'a' being the first interior angle of the triangle.Then she turned anticlockwise 360-b degrees, 'b' being another interior angle of the triangle. Then she turned 360-c degrees 'c' is also an interior angle. So altogether she turned (360-a)+(360-b)+(360-c). 360 multiplied by 3 is 1080, and a+b+c must be 180 because the angles inside a triangle add to 180 degrees. 1080-180= 900, so she turned 900 degrees around. It wont matter if its a different triangle because the angles in a triangle will always add to 180 degrees.