https://www.mathsisfun.com/angles.html
What Is An Angle?
An angle is formed between two lines that meet at a single point. It is often drawn with an arc (half circle)
Properties of Angles
Angles are measured in degrees which is the measurement of a rotation. A full rotation, which would bring you back to face in the same direction, is 360°. A half-circle is therefore 180°, and a quarter-circle, or right angle, is 90°.
Types of Angles
Angles can be categorized into 4 different categories: acute, right, obtuse, straight
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