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For some purposes it is preferable to retain the circular measure, i radians, as being undistinguishable from sin i and tan i when i is small as in direct fire.

Nauticus lays down—quite correctly—that the sine of an angle is less than its circular measure.

Thus, 7° 20' 10" in circular measure,             or 7' 20" 10''' in duodecimal long measure.

Let x represent the circular measure of an angle of 15�, and y half the sine of an angle of 30� = area of the square on the radius of a circle of diameter unity = .25.