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Diketahui vektor a = 4 i + 2 j ​ + 2 k dan b = 3 i + 3 j ​ . Besar sudut antara vektor a dan b adalah .... (UN 2012)

Diketahui vektor  dan . Besar sudut antara vektor  dan  adalah ....(UN 2012)

  1. 30 degree

  2. 45 degree

  3. 60 degree

  4. 90 degree

  5. 120 degree

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Diketahui vektor dan , maka: Besar sudut antara vektor dan yaitu:

Diketahui vektor begin mathsize 14px style a with rightwards arrow on top equals 4 i with rightwards arrow on top plus 2 j with rightwards arrow on top plus 2 k with rightwards arrow on top end style dan begin mathsize 14px style b with rightwards arrow on top equals 3 i with rightwards arrow on top plus 3 j with rightwards arrow on top end style, maka:

Besar sudut antara vektor begin mathsize 14px style a with rightwards arrow on top end style dan begin mathsize 14px style b with rightwards arrow on top end style yaitu:

cos space theta equals fraction numerator a with rightwards harpoon with barb upwards on top. b with rightwards harpoon with barb upwards on top over denominator open vertical bar a with rightwards harpoon with barb upwards on top close vertical bar open vertical bar b with rightwards harpoon with barb upwards on top close vertical bar end fraction

           begin mathsize 14px style equals fraction numerator 4.3 plus 2.3 plus 2.0 over denominator square root of 4 squared plus 2 squared plus 2 squared space end root. square root of 3 squared plus 3 squared plus 0 squared end root end fraction end style

           begin mathsize 14px style equals fraction numerator 18 over denominator square root of 24. square root of 18 end fraction end style

           begin mathsize 14px style equals fraction numerator 18 over denominator 2 square root of 6. space 3 square root of 2 end fraction end style

           begin mathsize 14px style equals fraction numerator 3 over denominator square root of 12 end fraction. fraction numerator square root of 12 over denominator square root of 12 end fraction end style

           begin mathsize 14px style equals fraction numerator 3 space. space 2 square root of 3 over denominator 12 end fraction end style

           begin mathsize 14px style equals 1 half square root of 3 end style

         begin mathsize 14px style theta equals 30 degree end style

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