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°=
`( \pi )/(180)`, so to convert -40° to radians, we are going to multiply -40° by the conversion factor
`( \pi )/(180)`; that way we can cancel degrees and express our answer in radians:

(-40°)
`(( \pi )/(180) )= -(2 \pi )/(9)`

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