line calculations using its known coordinates

2021 5 30
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更新时间：2021 5 30
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Hello every one
How to calculate the angle between two lines (lines have known coordinates)
Thanks

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回答（1 个）

William Rose
William Rose 2021-5-30

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Suppose slope of line 1 is a1 and slope of line 2 is a2. Then angle of line 1 relative to x axis is theta1=arctan(a1) and angle of line 2 is theta2=arctan(a2). Angle between lines is theta1-theta2.

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