What is an Angle

Angle Definition:

An angle is the figure formed by
two rays meeting at a common
end point called a vertex.
Write an angle using the ∠ symbol


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-clockwise
See +α in the picture above.
This is the opposite direction that clocks go

Negative Angles:

Negative angles go counter-clockwise
See -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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