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Reflex angle
Definition: An angle whose measure is greater than 180° and less than 360°
Try this Adjust the angle below by dragging an orange dot and see how the angle ∠ABC behaves. Note that it is a reflex angle only when it is between 180° and a full circle.
(If there is no image below, see support page.)


Some might argue than reflex angles are not real. They are the 'other half' of a smaller angle. Indeed if you refer to the angle ∠ABC without qualifying it,it is generally assumed that you mean the smallest angle. If you mean the large part of the angle, you must specify it by saying 'reflex angle ∠ABC'.
Types of angle
Altogether, there are six types of angle as listed below. Click on an image for a full description of that type and a corresponding interactive applet.

Acute angle Right Angle Obtuse Angle
Acute angle
Less than 90°		 Right angle
Exactly 90°		 Obtuse angle
Between 90° and 180°
Straight Angle Reflex Angle Full Angle
Straight angle
Exactly 180°		 Reflex angle
Between 180° and 360°		 Full angle
Exactly 360°


Related angle topics

General

Angle Types

Angle relationships

(C) 2007 Copyright John Page