Notion et mesure d'angle

Angle - Mathématiques 6e

Exercice 1 : Mesurer un angle sans côté horizontal à l'aide d'un rapporteur

Dans la figure suivante, quelle est la mesure de l'angle \(\widehat{AOB}\) ?

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On donnera la réponse suivie de l'unité qui convient.

Exercice 2 : Nommer des angles, plusieurs noms possibles

Cocher le ou les noms possibles de l'angle bleu :

\(\widehat{HID}\)
\(\widehat{FDO}\)
\(\widehat{ONH}\)
\(\widehat{FNH}\)
\(\widehat{OFN}\)
\(\widehat{OFH}\)

Exercice 3 : Reconnaître des angles obtus/aigus/droits/plats

Pour chacun des angles suivants, préciser sa nature:

Exercice 4 : Vocabulaire - côtés, sommets et demi-droite d'un angle

Voici une figure d'un angle :

Compléter les phrases suivantes par "côté", "angle", "demi-droite" ou "sommet".

Le point W est le de l ' \(\widehat{XWY}\) .

\([WY)\) est une , il s'agit d'un de l' \(\widehat{XWY}\) .

Exercice 5 : Nommer les côtés d'un angle

Soit la figure suivante :

Nommer les côtés de l'angle indiqué en bleu.
On notera chacun des côtés en les séparant par un point virgule.

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