Angles

Angles:( denoted by Ð )
Angles are geometric figures made from two rays having the same endpoint The endpoint is called the vertex and the rays are called the sides of the angle. The side being rotated is called the initial side and the other side is the terminal side.

ÐABC, ÐCBA Ð B or q can be used to name angles.
The vertex is always in the middle of the angle.

Angles are measured in degrees or in radians. Degrees are the most common used unit for measuring angles, but in many modern applications the radians is used most often. Gradians is another unit of measure for angles which is commonly used in Europe and for surveying.

Angles are measured positive when they are rotated counter-clockwise and negative when rotated clockwise.

The initial side can be rotated several times before stopping at the terminal side.