convex angle
A positive angle is if it is at most 180 , i.e. $\pi $ radians. Cf. the convex set.
A convex angle $\alpha $ is

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straight if $\alpha ={180}^{\mathrm{o}}$,

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obtuse if $$,

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right if $\alpha ={90}^{\mathrm{o}}$,

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acute if $$,

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skew if it is acute or obtuse.
Note. The angle between two curves (http://planetmath.org/ConformalMapping) which intersect each other in a point $P$ means the angle between the tangent lines of the curves in $P$; such an angle may always be chosen acute or right.
Title  convex angle 
Canonical name  ConvexAngle 
Date of creation  20130322 14:48:07 
Last modified on  20130322 14:48:07 
Owner  pahio (2872) 
Last modified by  pahio (2872) 
Numerical id  17 
Author  pahio (2872) 
Entry type  Definition 
Classification  msc 51M04 
Related topic  Quadrant^{} 
Related topic  SolidAngle 
Related topic  OrthogonalCurves 
Related topic  ComplementaryAngles 
Related topic  ContourLine 
Defines  straight angle 
Defines  obtuse angle^{} 
Defines  right angle 
Defines  acute angle 
Defines  straight 
Defines  obtuse 
Defines  right 
Defines  acute 