Given an angle A, the angle (2pi - A) has the same cosine. So do the angles that differ from these by 2k*pi radians for all integers k. If you are still working in degrees, you should substitute 180 degrees for pi radians.
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The sine and cosine of acute angles are equal only for 45° sin45° = cos 45° = 1/sqrt(2) = 0.7071
By using the cosine rule in trigonometry the angles of the triangle can be worked out.
Congruent angles (or equivalent angles) have the same angle measure.
they are the opposite of same side interior angles
Angles are equal or congruent to each other when the measurements of the angles are the same.