Answer:
3π/13
Explanation:
In order to find the reference angle of a given angle, first of all, its quadrant is determined
In order to determine the quadrant,
10π/13=10(180)/13
=138.46
As the given angle belongs to 2nd quadrant, it will be subtracted from 180 degrees also denoted by pi.
So,
Reference angle for 10π/13= π-10π/13
=(13π-10π)/13
=3π/13
So the reference angle for 10π/13 is 3π/13 ..