Find the angle supplementary to: 2 pie over 9

Question

Choices are ;

 

5 pie over 18

 

18 pie over 9

 

7 pie over 18

 

7 pie over 9

Answer 1

Two angles are supplementary when they add up to 180 degrees or pi radians.

so in this case we have that

Π - (2Π/9)= 7Π/9 is the last choice