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Definition: An angle is a way of measuring a part of a circle. Angles are measured in degrees with the symbol °.
Interactivity
- Click and drag the point С to change the angle <ABC .
Regulations: Angle <ABC - basics
- An angle of 90° is a fourth of a circle.
- An angle of 90° is called a right angle.
- An angle of 90° is marked by a square (make an angle of 90° in the interactivity below!).
- An angle of 180° is a half of a circle.
- An angle of 180° is the line segment \overline{CA} where the point B is the midpoint.
- An angle of 360° is the whole circle.
- An angle of 360° is the line segment \overline{BA} and the points А and С overlap.
- An angle of 360° cannot be draw in the interactivity (it automatically reverts to the coterminal angle 0°).
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