Two angles are coterminal if they differentiate in a factor of k*(2pi). This is a multiple of 360 degrees.
In this case 21 [pi /10] = [pi / 10] + 20 [pi/10] = [pi/10] + 2pi, then 21pi/10 is coterminal with pi/10.
In the case of -pi/10 you cannot get to pi/10 by adding a multiple of 2pi , then they are not coternminals.
Conclusion: you would not be right.
Option 1 is the Answer.
For explanation, then please check the attached image.
<em>By </em><em>Benjemin</em>
your question is not really a question.
60×3=180 is the answer for your question
Minute=60 secs
