Parallélisme et perpendicularité - 6e

Droites perpendiculaires

Exercice 1 : Tracer sur quadrillage la parallèle et la perpendiculaire à une droite (parmi plusieurs) passant par un point

Construire la parallèle et la perpendiculaire à \((x)\) passant par \(D\).

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Essais restants : 2

Exercice 2 : Problème - Droites perpendiculaires, parallèles, angles droits et nature de quadrilatère

On s'intéresse à la figure ci-dessous :

En plus des marquages, on sait que les droites \( (DA) \) et \( (BC) \) sont parallèles.

En utilisant le codage ou en raisonnant, répondre aux questions suivantes.

Parmi ces droites, lesquelles sont parallèles entre elles ?

A. \( (AB) \) et \( (CD) \)
B. \( (DA) \) et \( (BC) \)
C. \( (AE) \) et \( (BF) \)

Parmi ces angles, le ou lesquels sont des angles droits ?

A. \( \widehat{ABC} \)
B. \( \widehat{BAD} \)
C. \( \widehat{AEF} \)

Quelle est la nature du quadrilatère \( ABCD \) ?

Exercice 3 : Problème - Identifier si des droites sont parallèles, sécantes, ou perpendiculaires

Voici une figure représentant deux droites \( (d_1) \) et \( (d_2) \) :

En faisant attention aux marquages de la figure, compléter les phrases suivantes à propos de la figure avec "sont", "ne sont pas", "semblent" ou "ne semblent pas" :

Les droites \( (d_1) \) et \( (d_2) \) sécantes.

Les droites \( (d_1) \) et \( (d_2) \) parallèles.

Les droites \( (d_1) \) et \( (d_2) \) perpendiculaires.

Exercice 4 : Tracer sur quadrillage la parallèle à une droite (parmi plusieurs) et passant par un point

Construire la perpendiculaire à \((r)\) passant par \(S\).

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Essais restants : 2

Exercice 5 : Tracer sur quadrillage les parallèles ou les perpendiculaires à deux droites passant par un point

Construire les parallèles passant par \(L\) de chacune de ces deux droites.

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Essais restants : 2

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