Find the reference angle of 10pi/13

3π/13

Step-by-step 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 ...