The Math Forum

Ask Dr. Math - Questions and Answers from our Archives
Associated Topics || Dr. Math Home || Search Dr. Math

Reflex Angle

Date: 11/30/98 at 02:05:07
From: Roshan Shariff
Subject: Reflex angle

What is a reflex angle?

Date: 11/30/98 at 06:00:05
From: Doctor Pat
Subject: Re: Reflex angle

It depends a little on the area you work in. After plane geometry, it 
is usually defined as an angle between 180 and 360 degrees. In plane 
geometry it is often defined as an angle that makes a polygon concave: 
think of one that bends into a polygon and not out. 

I will try to make an ASCII drawing showing the angle at vertex A as 
the reflex angle:

    E      B
    |\    /|
    | \  / |
    |  \/  |
    |   A  |
    |      |
    B      C

- Doctor Pat, The Math Forum   
Associated Topics:
High School Definitions
High School Euclidean/Plane Geometry
High School Geometry
Middle School Definitions
Middle School Geometry
Middle School Two-Dimensional Geometry

Search the Dr. Math Library:

Find items containing (put spaces between keywords):
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words

Submit your own question to Dr. Math

[Privacy Policy] [Terms of Use]

Math Forum Home || Math Library || Quick Reference || Math Forum Search

Ask Dr. MathTM
© 1994- The Math Forum at NCTM. All rights reserved.