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In Geometry we use term "ray" to define an angle. Ray is a line with the start point but no end point. Angle is the figure formed by two rays with the common start point, called the
vertex of the angle.
Names of given angle are: / ABC or / CBA or / B
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an angle is the conjoining point between two intersecting lines. these can be measured in degrees or radians. for example, a triangle ("tri- angle") has three angles, with all three adding up to 180 degrees. a square/rectangle has four angles, all of which are 90 degrees.
/_ this is an acute angle, it is smaller than 90 degrees
|_ this is a right angle, it is 90 degrees
\_ this is an obtuse angle, it is greater than 90 degrees