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A triangle has 180 degrees and has 3 sides. A square has 360 degrees and has 4 sides. A triangle is 180 times 1, which is 3-2. A square is 180 times 2, which is 4-2. etc. etc.
7/3 x 90 = 210 degrees.
150 because 1 2/3=5/3 5/3 times 90=150 degrees
(n - 2) times 180 degrees. Triangle: n=3, n-2=1 ===> 180 degrees Square: n=4, n-2=2 ===> 360 degrees etc.
2*2*3= 12