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Qu'est-ce (qui) est exterior angle - définition

TERM IN GEOMETRY

Interior angle; Interior angles; Exterior angle; External angle; Internal angle; Angle sum of polygon; Angle sum of polygons; ∠ sum of polygons; Internal and external angle; Exterior angles; Turning angle; Turn angle

exterior angle

¦ noun Geometry the angle between a side of a rectilinear figure and an adjacent side extended outward.

Exterior angle theorem

MATHEMATICAL THEOREM

Remote Interior Angle Theorem; Remote interior angle theorem; High school exterior angle theorem

The exterior angle theorem is Proposition 1.16 in Euclid's Elements, which states that the measure of an exterior angle of a triangle is greater than either of the measures of the remote interior angles.

https://en.wikipedia.org/wiki/Exterior_angle_theorem

interior angle

¦ noun the angle between adjacent sides of a rectilinear figure.

Wikipédia

Internal and external angles

In geometry, an angle of a polygon is formed by two sides of the polygon that share an endpoint. For a simple (non-self-intersecting) polygon, regardless of whether it is convex or non-convex, this angle is called an interior angle (or internal angle) if a point within the angle is in the interior of the polygon. A polygon has exactly one internal angle per vertex.

If every internal angle of a simple polygon is less than π radians (180°), then the polygon is called convex.

In contrast, an exterior angle (also called an external angle or turning angle) is an angle formed by one side of a simple polygon and a line extended from an adjacent side.^{: pp. 261-264}

https://en.wikipedia.org/wiki/Internal and external angles