Question

An angle co-terminal with 5pi/7 is:
a) -9pi/7
b) -2pi/7
c) 12pi/7
d) 20pi/7

Answer 1

To find co-terminal angles, add or subtract 2π. Make sure the denominator is the same as the original problem.

5π/7
+ 14π/7
19π/7


5π/7
- 14π/7
-9π/7

a