Step by step calculator to find the coterminal angle to a given angle. Free Mathematics Tutorials. Home; Calculator to Find Coterminal Angle to a Given Angle. 1 A A coterminal angle $\theta_c$ is another angle that has the same terminal side as the given angle $\theta$. The circumference of the entire circle is 2 is about 3.14159, so it follows that 360° equals 2 radians. Hence, 1° equals /180 radians, and 1 radian equals 180/ degrees. Most calculators can be set to use angles measured with either degrees or radians. Be sure you know what mode your calculator is using. Coterminal angles are two angles that are drawn in the standard position so their initial sides are on the positive x-axis and have the same terminal side like 110° and -250° Another way to describe coterminal angles is that they are two angles in the standard position and one angle is a multiple of 360 degrees larger or smaller than the other. By using this rate calculator, you agree that Radian is not responsible for, and shall have no liability with respect to, any discrepancy between this Quote and the actual premium rate quote charged after final review of an application. If you requested a Lender Paid Mortgage Insurance LPMI. 02/12/2007 · By the time you get too far in math, you will need to have them all memorized. For your example, sin of 150 degrees would be 1/2. Cos would be sqrt3/2 and tan would be sin/cosine.