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Diketahui titikA(1, 0, –2), B(2, 1, –1), C(2, 0, –3). Sudut antara vektor A B dengan A C adalah...

Diketahui titik A(1, 0, –2), B(2, 1, –1), C(2, 0, –3). Sudut antara vektor  dengan  adalah...

  1. 30 to the power of o

  2. 45 to the power of o

  3. 60 to the power of o

  4. 90 to the power of o

  5. 120 to the power of o

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begin mathsize 14px style stack A B with rightwards arrow on top equals B minus A equals open parentheses table row 2 row 1 row cell negative 1 end cell end table close parentheses minus open parentheses table row 1 row 0 row cell negative 2 end cell end table close parentheses equals open parentheses table row 1 row 1 row 1 end table close parentheses stack A C with rightwards arrow on top equals C minus A equals open parentheses table row 2 row 0 row cell negative 3 end cell end table close parentheses minus open parentheses table row 1 row 0 row cell negative 2 end cell end table close parentheses equals open parentheses table row 1 row 0 row cell negative 1 end cell end table close parentheses  cos space alpha equals fraction numerator stack A B with rightwards arrow on top space. space stack A C with rightwards arrow on top over denominator open vertical bar stack A B with rightwards arrow on top close vertical bar open vertical bar stack A C with rightwards arrow on top close vertical bar end fraction space space space space space space space space space space equals fraction numerator open parentheses table row 1 row 1 row 1 end table close parentheses. open parentheses table row 1 row 0 row cell negative 1 end cell end table close parentheses over denominator open parentheses square root of 1 squared plus 1 squared plus 1 squared end root close parentheses open parentheses square root of 1 squared plus 0 squared plus left parenthesis negative 1 right parenthesis squared end root close parentheses end fraction space space space space space space space space space space equals fraction numerator 1 plus 0 minus 1 over denominator square root of 3. square root of 2 end fraction equals 0  cos space alpha equals 0 rightwards arrow alpha equals 90 to the power of o end style

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