To convert degrees to radians, you can use the following formula:
Radians = Degrees × (π / 180)
For 140 degrees, we can plug it into the formula:
Radians = 140 × (π / 180)
Now, simplify the multiplication:
Radians = (140π) / 180
This simplifies to:
Radians = (14π) / 18 = (7π) / 9
Therefore, the equivalent radian measure for 140 degrees is (7π) / 9.