Angle Definition:
An angle is the figure formed byWrite an angle using the ∠ symbol
two rays meeting at a common
end point called a vertex.
Two rays, BA and BC intersect at vertex B to form the angle in the image
2 ways to refer to this angle:
∠ ABC∠ B
Angle Measurement:
Angles are measured using degrees.6 types of angles:
0° ≤ Acute Angle < 90°Right Angle measures 90°
90° < Obtuse Angle < 180°
Straight Angle measures 180°
180° < Reflex Angle < 360°
Complete Angle measures 360°
Positive and Negative Angle Direction
Positive Angles:
Positive angles go counter-clockwiseSee +α in the picture above.
This is the opposite direction that clocks go
Negative Angles:
Negative angles go counter-clockwiseSee -α in the picture above.
This is the same direction that clocks go
How does the What is an Angle Calculator work?
Free What is an Angle Calculator - This lesson walks you through what an angle is and how to use it
What 3 concepts are covered in the What is an Angle Calculator?
- angle
- the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.
- geometry
- study of math dealing with shapes, space, and properties of space
- what is an angle
What is an Angle Calculator Video
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