To solve this, we are going to multiply our degrees by a conversion factor. Remember that 1°=[tex] \frac{ \pi }{180} [/tex], so to convert -40° to radians, we are going to multiply -40° by the conversion factor [tex] \frac{ \pi }{180} [/tex]; that way we can cancel degrees and express our answer in radians:
(-40°)[tex] (\frac{ \pi }{180} )= -\frac{2 \pi }{9} [/tex]
We can conclude that the correct answer is: B). -2π/9
