# Geometry - Measuring and Constructing Angles

Angles appear often in geometry. Whether you are measuring the angles in a triangle, or determining an angle's type, understanding angles is important. We've got you covered with today's free geometry video on Measuring and Constructing Angles. Professor Burger starts off showing you how to properly name angles based upon two rays and their common endpoint. He then moves into classifying angles. You'll learn about two basic types including the acute angle, an angle that measures greater than 0 and less than 90, and the obtuse angle, which measures greater than 90 and less than 180. If you've never seen a protractor before, you'll learn how to use one to measure angles. The course then moves on to using the Angle Addition Postulate so find the measurement of an angle. And finally, Professor Burger discusses an angle bisector, which is a ray that divides an angle into two congruent angles. Today's video has four lectures on it and you'll want to watch them all. In order to move to the next lecture, make sure you click on the forward button directly to the left of the time stamp.