Figures planes - 6e

Triangles particuliers

Exercice 1 : Vocabulaire - sommet, côté, adjacent, opposé, hypoténuse, sommet principal

Compléter les phrases suivantes à l'aide de la figure ci-dessous.

Le segment ... est l'hypoténuse de la figure.

Le sommet \(J\) est le sommet de l'angle opposé au côté ...

Le côté \([IK]\) est le côté opposé au sommet ... .

Le point ... est le sommet principal de la figure.

Lister le sommet des angles adjacents au côté \([IJ]\).
On donnera la liste séparée des points-virgules.
Exemple : \(A;B\)

Lister les côtés adjacents au sommet \(J\).
On donnera la liste séparée par des points-virgules.
Exemple : \([AB];[AC]\)

Exercice 2 : Reconnaître un triangle particulier (isocèle, équilatéral, rectangle)

Donner la nature exacte des triangles suivants :

Si le triangle n'a pas de particularité, on écrira "quelconque".

Exercice 3 : Reconnaître un triangle isocèle

Parmi les triangles suivants, lesquels sont isocèles ?

Exercice 4 : Reconnaître un triangle rectangle

Parmi les triangles suivants, lesquels sont rectangles ?

1.

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2.

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3.

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4.

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Exercice 5 : Reconnaître un triangle équilatéral

Parmi les triangles suivants, lesquels sont équilatéraux ?

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