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Given a line: (x1,y1)-(x2,y2)

given a line; (x1,0)-(x2,100)

how can i find the angle of these 2 lines?

given a line; (x1,0)-(x2,100)

how can i find the angle of these 2 lines?

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Radians = ArcTangent( (Y2-Y1) / (X2-X1) )

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From the help:

The Atn function takes the ratio of two sides of a right triangle (number) and returns the corresponding angle in radians. The ratio is the length of the side opposite the angle divided by the length of the side adjacent to the angle.

The range of the result is -pi/2 to pi/2 radians.

To convert degrees to radians, multiply degrees by pi/180. To convert radians to degrees, multiply radians by 180/pi.

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Example code:

'...

'''Picture1.ScaleMode = 3 'Pixel

Dim X1, X2, Y1, Y2 As Double

Dim mPI As Double

Dim angle As Double

mPI = 4 * Atn(1) 'define PI

X1 = 0

Y1 = 0

X2 = 10

Y2 = 100

Picture1.Line (X1, Y1)-(X2, Y2) 'Draw the line

If X2 <> X1 Then 'Prevent division by 0

'Calculate angle

angle = Atn((Y2 - Y1) / (X2 - X1)) * (180 / mPI)

Else

angle = 90

End If

Debug.Print angle

'...

You will have to adjust the sign of the angle depending on your coordinate system.