An angle that shares the same sine value of an angle that measures 5pi/4 radians is located where?

Find the angle in degrees first:
Substitute 180 for pi.
(5 x 180) / 4
900 / 4
= 225 degrees
Now, the angle that has the same sin value of 225 is the angle's reference angle, or the angle that it makes with the x-axis.
225-180 = 45

45 is the angle that shares the same sin value 

45 degrees

Hope this helps :)

4should be the last one n=4