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The cosine function is an even function which means that cos(-x) = cos(x). So, if cos of an angle is positive, then the cos of the negative of that angle is positive and if cos of an angle is negative, then the cos of the negative of that angle is negaitive.
Since a circle is 360 degrees, negative 330 will look like positive 30, the difference between any two numbers on a clock face.
The line has a negative slope (or negative gradient).When the angle between the line and the positive direction of Ox is obtuse then the slope is negative. Conversely, when the angle is acute, the slope is positive.
The complement of a 55 degree angle is a 35 degree angle
A 12 degree angle is an acute angle.