Figures planes - 6e
Quadrilatères particuliers
Exercice 1 : Reconnaître un losange par ses diagonales
Parmi les quadrilatères suivants, lesquels sont des losanges ?
- 1.
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- 2.
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- 3.
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- 4.
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Exercice 2 : Reconnaître des quadrilatères particuliers dans une figure complexe
On considère la figure ci-dessous :
Combien y-a-t'il de quadrilatères sur cette figure ?
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Combien y-a-t'il de quadrilatères sur cette figure ?
Donner la nature exacte du quadrilatère \(CARP\).
Exercice 3 : Reconnaître un rectangle par ses diagonales
Parmi les quadrilatères suivants, lesquels sont des rectangles ?
- 1.
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- 2.
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- 3.
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- 4.
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Exercice 4 : Reconnaître un carré par ses diagonales
Parmi les quadrilatères suivants, lesquels sont des carrés ?
- 1.
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- 2.
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- 3.
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- 4.
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Exercice 5 : Problème - Propriétés des diagonales et triangles particuliers dans un rectangle/carré/losange
\( BCDE \) est un losange dont les diagonales se coupent en \( O \).
On sait que \( 6\:\text{cm} = BD \).
Donner la longueur de \( [BO] \) si l'énoncé le permet. Dans le cas contraire, écrire "Impossible".
Donner la longueur de \( [CE] \) si l'énoncé le permet. Dans le cas contraire, écrire "Impossible".
Quelle est la nature du triangle \( CDE \) ?
On choisira la réponse la plus précise possible.
On choisira la réponse la plus précise possible.
Quelle est la nature du triangle \( COD \) ?
On choisira la réponse la plus précise possible.
On choisira la réponse la plus précise possible.