Find angles between the lines x + y = 1 and x + y = 1.

Given lines are x + y = 1 and x + y = 1.

Slope of line (1) is m1 = -√3, while the slope of line (2) is m2 = -1/√3

Let θ be the angle between two lines

θ = 30°

Thus the angle between the given lines is either 30° or 180° - 30° = 150°

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