There are different types of angles, below we have examples of the acute, right and obtuse angles.
Also, the sum of the angles of a straight line equals 180 degrees.
If you have a full circle, then the measurement of the angles around the point is 360 degrees. Also angles that face each other such as A and D or B and E are equal to each other.
Also there are two types of angles supplementary and complementary.
When two lines are parallel crossed by a line (called the transversal) you need to remember which angle is equal to each other. An old trick is to write X Y and Y X in the bottom in order to identify equal angles.