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Pertanyaan

Diketahui vector-vektor a = ( 1 , 3 , 3 ) , b = ( 3 , 2 , 1 ) dan c = ( 1 , − 5 , 0 ) sudut antara vektor ( a − b ) dan ( a + c ) adalah…

Diketahui vector-vektor  dan  sudut antara vektor  dan  adalah…

  1. 30°

  2. 45°

  3. 60°

  4. 90°

  5. 120°

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A. Acfreelance

Master Teacher

Jawaban terverifikasi

Jawaban

 begin mathsize 14px style straight alpha equals 90 degree end style

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Pembahasan

Untuk mengetahui besar sudutnya gunakan rumus Sehingga

begin mathsize 14px style straight a with rightwards arrow on top minus straight b with rightwards arrow on top equals open parentheses table row 1 row 3 row 3 end table close parentheses minus open parentheses table row 3 row 2 row 1 end table close parentheses equals open parentheses table row cell negative 2 end cell row 1 row 2 end table close parentheses straight a with rightwards arrow on top minus straight c with rightwards arrow on top equals open parentheses table row 1 row 3 row 3 end table close parentheses plus open parentheses table row 1 row cell negative 5 end cell row 0 end table close parentheses equals open parentheses table row 2 row cell negative 2 end cell row 3 end table close parentheses end style 

Untuk mengetahui besar sudutnya gunakan rumus

begin mathsize 14px style cos space straight alpha equals fraction numerator open parentheses straight a with rightwards arrow on top minus straight b with rightwards arrow on top close parentheses space. space open parentheses straight a with rightwards arrow on top plus straight c with rightwards arrow on top close parentheses over denominator open vertical bar straight a with rightwards arrow on top minus straight b with rightwards arrow on top close vertical bar space open vertical bar straight a with rightwards arrow on top plus straight c with rightwards arrow on top close vertical bar end fraction cos space straight alpha equals fraction numerator open parentheses table row cell negative 2 end cell row 1 row 2 end table close parentheses space. space open parentheses table row 2 row cell negative 2 end cell row 3 end table close parentheses over denominator square root of open parentheses negative 2 close parentheses squared plus 1 squared plus 2 squared end root space square root of 2 squared plus open parentheses negative 2 close parentheses squared plus 3 squared end root end fraction equals 0 end style 

Sehingga begin mathsize 14px style straight alpha equals 90 degree end style

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