[RESOLVED] Trigonometery

[toecutter]

Hi

How would i write this formula in vb.net[2005]?

Tan(25) * Cos(45) = -Tan

I am trying to obtain the hip pitch of a roof when knowing only the roof pitch

regards

toe

[toecutter]

Probably dosn't make much sense to anyone but just incase

         'formula for roof pitch to hip pitch
                'tan[roof pitch] * cos[hip angle] = -tan
                'TRIG CALCULATIONS
                Const Pi As Double = 3.14159265358979 'COS
                Dim rRoofpitch As Double = Drawing.lblPitch.Text
                Dim tTanRoofPitchXcCosHipAngle As Double = 0.0
                tTanRoofPitchXcCosHipAngle = (Math.Tan(rRoofpitch * (Pi / 180)) * 0.707106781)          'ROOF PITCH TO HIP PITCH
                Dim hHipPitch As Double = 0.0
                hHipPitch = Math.Atan(tTanRoofPitchXcCosHipAngle) * 180 / Pi                           'INVERT TANGENT to get true hip pitch
                Dim tTrueHipLength As Double = 0.0
                tTrueHipLength = _length / Math.Cos(hHipPitch * (Pi / 180))                            'planHipLength to True hip length