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ACTIVITE 2

ACTIVITE 2. Cosinus d’un angle aigu. Exercice 1. [DF]. [EF]. cosF =EF/DF. DFE. [IJ]. [JK]. IJK. cosJ =JK/JI. [MN]. [MP]. PMN. cosM =MN/MP. [AB]. [BC]. cosB =BC/AB. ABC. [TR]. [TS]. cosT =TS/TR. STR. Exercice 2.

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ACTIVITE 2

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  1. ACTIVITE 2 Cosinus d’un angle aigu

  2. Exercice 1 [DF] [EF] cosF =EF/DF DFE [IJ] [JK] IJK cosJ =JK/JI [MN] [MP] PMN cosM =MN/MP [AB] [BC] cosB =BC/AB ABC [TR] [TS] cosT =TS/TR STR

  3. Exercice 2 a. Calculer à l’aide de la touche cos de la machine le cosinus de chaque angle.(Arrondir le résultat au centième) 0,5 0,57 0,94 0,71 0,75 1 0 0,31 0,87 0,05

  4. Exercice 2 b. Calculer à l’aide de la touche cos-1 de la machine l’angle dont on connaît le cosinus.(Arrondir l’angle à l’unité) 90° 50° 80° 45° 10° n’existe pas 30° 33° 60° 0°

  5. Exercice 2 c. Compléter le tableau suivant : (arrondir les angles à l’entier, le cosinus au millième) 0,208 15° 0,755 22° 47° 0,156 84° 0,656 43° 0,985 56° 0,966 75° 0,707 30° 0,574 89° 0,906 73° 1,000

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