Figures planes - 6e

Triangles particuliers

Exercice 1 : Reconnaître un triangle équilatéral

Parmi les triangles suivants, lesquels sont équilatéraux ?

Exercice 2 : Reconnaître un triangle rectangle

Parmi les triangles suivants, lesquels sont rectangles ?

1.

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2.

{"init": {"range": [[-10.547470333696639, 1.0], [-8.26951237891391, 4.978112639040266]], "scale": [30, 30]}, "label": [[[0.0, 0.0], "E", "right", {}], [[-3.0289634912141294, 3.9781126390402664], "F", "above", {}], [[-9.547470333696639, -7.269512378913911], "G", "below left", {}], [[-1.0371082289222326, 2.3525319384658285], "5"], [[-4.410259547902624, -4.112129706141787], "12"], [[-6.807338067130193, -1.344845707976091], "13"]], "path": [[[[0.0, 0.0], [-3.0289634912141294, 3.9781126390402664], [-9.547470333696639, -7.269512378913911], [0.0, 0.0]]], [[[0.0, 0.0], [-0.30289634912141294, 0.39781126390402666], [-0.7007076130254395, 0.09491491478261371], [-0.3978112639040266, -0.30289634912141294], [0.0, 0.0]]]], "line": [[[0.0, 0.0], [-3.0289634912141294, 3.9781126390402664], {"subtype": "segment"}], [[0.0, 0.0], [-9.547470333696639, -7.269512378913911], {"subtype": "segment"}], [[-3.0289634912141294, 3.9781126390402664], [-9.547470333696639, -7.269512378913911], {"subtype": "segment"}]]}
3.

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4.

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Exercice 3 : 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 \(C\) est le sommet de l'angle opposé au côté ...

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

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

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

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

Exercice 4 : Identifier la nature des triangles sur une figure (QCM)

Exercice 5 : Reconnaître un triangle isocèle

Parmi les triangles suivants, lesquels sont isocèles ?

Revenir au choix du niveau