A ray is a dot at one end of the line and a arrow at the other end.
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An obtuse angle is between 90o and 180o.90o is a right angle.Between 90o and 180o is an obtuse angle.180o is a straight angle.A right angle is like this (look at ray A):A^|||L-----------> exactly 90oA straight angle is this (look again at ray A):A 180o is flatFor an obtuse angle, the A should be somewhere between the places where A was in the right and the straight angles.
The two rays that form an angle are called the legs or sides of the angle. The meeting point of the two rays that form an angle is called the vertex.
what is a ray
the angle of incidence is the initial ray angle and the angle of reflection is the reflected ray angle
Angle of Incidence = Angle of ReflectionThis is only true if the angle of incidence is greaterthan the critical angle.