Enter the primary angle (degrees) into the Calculator. The calculator will evaluate the Reflex Angle. 

Reflex Angle Formula

RA = PA + 180


  • RA is the Reflex Angle (degrees)
  • PA is the primary angle (degrees)

To calculate Reflex Angle, add 180 to the primary angle.

How to Calculate Reflex Angle?

The following steps outline how to calculate the Reflex Angle.

  • First, determine the primary angle (degrees). 
  • Next, gather the formula from above = RA = PA + 180.
  • Finally, calculate the Reflex Angle.
  • After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

primary angle (degrees) = 40