Question

Change -40° to radians. A). 2π/9 B). -2π/9 C). 4π/9 D). -4π/9

Answer 1

To solve this, we are going to multiply our degrees by a conversion factor. Remember that 1°=$\frac{ \pi }{180}$, so to convert -40° to radians, we are going to multiply -40° by the conversion factor $\frac{ \pi }{180}$; that way we can cancel degrees and express our answer in radians:

(-40°)$(\frac{ \pi }{180} )= -\frac{2 \pi }{9}$

We can conclude that the correct answer is: B). -2π/9