Question 63786
consider any point .say origin in coordinate system X'OX and Y'OY.take a line OA on X axis to start with.let it travel in anticlockwise direction .when it reaches OY it completes 90 deg..if it goes further meeting OX on the opposite side OX"' ,it completes 180 deg.
if it goes further it meets Y axis in opposite direction OY'.then it completes 270 deg
if it goes further it comes back to X axis OX .then we say it completed 360 deg.
so 360 deg. angle is one complete circle around a point coming back to original position.