Angle: Formed by two rays (sides) from a common point (vertex).

Degree: 1/360 of a full rotation. π radians = 180°.

Radian: Angle subtended by arc equal in length to the radius.

Types of angles: acute (<90°), right (90°), obtuse (90°–180°), straight (180°), reflex (>180°).

Angle: 45°

Radians: 0.79

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