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14.2
We're guessing that you mean "radian" measure.To change an angle in degrees to one in radians, multiply it by pi/180 .That number is about 0.0175 . (rounded)You could also divide degrees by 57.296 . (rounded)213 degrees = 3.7176 radians. (rounded)
If you mean: (2, 13) and (-4, -11) then the slope is 4 and both equations will have the same slope of 4 but with different y intercepts
You can make six different combinations: 123 132 213 231 321 312. If you just need to know the number of combinations, you could find the answer without writing everything out by letting x represent the number of digits and calculating x*(x-1).