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en.wikipedia.org/wiki/Angle

In Riemannian

www.khanacademy.org/math/geometry/parallel-and-perpendicular-lines

This tutorial will define what an

www.khanacademy.org/math/basic-geo/basic-geo-angles/basic-geo-angle-basics/v/angle-basics

Two rays that share the same endpoint form an

www.mathsisfun.com/definitions/angle.html

www.mathsisfun.com/angles.html

Obtuse

www.mathopenref.com/angle.html

Vertex, The vertex is the common point at which the two lines or rays are joined.
Point B is the figure above is the vertex of the

www.khanacademy.org/math/basic-geo/basic-geo-angles/basic-geo-angle-basics/v/using-a-protractor

Sal uses a virtual

www.mathplayground.com/measuringangles.html

For fun and educational

www.abcya.com/measuring_angles.htm

ABCya's

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