Dr. Olivier answers the question: 'What Are The Two Main Types Of Glaucoma?' Aug. 24, 2009— -- Question: What is glaucoma, what are the two main types of glaucoma, and how common are they? (open ...

An angle is the space between two lines that start at the same point. This point is called the vertex. Angles measure the size of a turn in degrees. You can show degrees using the symbol ° after the ...