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Besar vektor a = 3 satuan, vektor b = 4 satuan dan a + b = 5 satuan. Besar sudut yang diapit oleh vektor a dan b adalah....

Pertanyaan

Besar vektor a = 3 satuan, vektor b = 4 satuan dan a + b = 5 satuan. Besar sudut yang diapit oleh vektor a dan b adalah....space

  1. 45°

  2. 60°

  3. 90°

  4. 120°

  5. 180°

Pembahasan Soal:

table attributes columnalign right center left columnspacing 0px end attributes row cell a with rightwards harpoon with barb upwards on top end cell equals cell 3 space satuan end cell row cell b with rightwards harpoon with barb upwards on top end cell equals cell 4 space satuan end cell row cell a with italic rightwards harpoon with barb upwards on top italic plus b with italic rightwards harpoon with barb upwards on top end cell equals cell 5 space satuan end cell row cell open vertical bar a with italic rightwards harpoon with barb upwards on top italic plus b with italic rightwards harpoon with barb upwards on top close vertical bar end cell equals cell square root of a with italic rightwards harpoon with barb upwards on top squared plus b with italic rightwards harpoon with barb upwards on top squared plus 2 times straight a with rightwards harpoon with barb upwards on top times straight b with rightwards harpoon with barb upwards on top times cos space straight theta end root end cell row 5 equals cell square root of 3 squared plus 4 squared plus 2 times 3 with rightwards harpoon with barb upwards on top times 4 times cos space straight theta end root end cell row 0 equals cell 24 times cos space straight theta end cell row cell cos space straight theta end cell equals 0 row straight theta equals cell 90 to the power of 0 end cell end table

Jadi, jawaban yang tepat adalah C

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 19 Juli 2021

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