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Diketahui vektor a = ( − 1 9 ​ ) dan vektor b = ( − 3 0 ​ ) . Hitunglah sudut antara vektor a dan b .

Diketahui vektor  dan vektor . Hitunglah sudut antara vektor .

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D. Entry

Master Teacher

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besar sudutantara vektor adalah .

besar sudut antara vektor a with rightwards arrow on top space dan space b with rightwards arrow on top adalah 83 comma 66 degree.

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Pembahasan

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Menentukan Menentukan Menentukan sudut Jadi, besar sudutantara vektor adalah .

Menentukan a with rightwards arrow on top times b with rightwards arrow on top 

table attributes columnalign right center left columnspacing 0px end attributes row cell a with rightwards arrow on top times b with rightwards arrow on top end cell equals cell left parenthesis left parenthesis negative 1 right parenthesis cross times left parenthesis negative 3 right parenthesis right parenthesis plus left parenthesis 9 cross times 0 right parenthesis end cell row blank equals cell 3 plus 0 end cell row blank equals 3 end table 

Menentukan vertical line a with rightwards arrow on top vertical line 

table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line a with rightwards arrow on top vertical line end cell equals cell square root of left parenthesis negative 1 right parenthesis squared plus 9 to the power of 2 end exponent end root end cell row blank equals cell square root of 1 plus 81 end root end cell row blank equals cell square root of 82 end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line b with rightwards arrow on top vertical line end cell equals cell square root of left parenthesis negative 3 right parenthesis squared plus 0 squared end root end cell row blank equals cell square root of 9 plus 0 end root end cell row blank equals 3 end table 

Menentukan sudut 

table attributes columnalign right center left columnspacing 0px end attributes row cell cos space alpha end cell equals cell fraction numerator a with rightwards arrow on top times b with rightwards arrow on top over denominator vertical line a with rightwards arrow on top vertical line vertical line b with rightwards arrow on top vertical line end fraction end cell row cell cos space alpha end cell equals cell fraction numerator 3 over denominator square root of 82 times 3 end fraction end cell row cell cos space alpha end cell equals cell fraction numerator 1 over denominator square root of 82 end fraction end cell row alpha equals cell cos to the power of negative 1 end exponent left parenthesis fraction numerator 1 over denominator square root of 82 end fraction right parenthesis end cell row alpha equals cell 83 comma 659 degree almost equal to 83 comma 66 degree end cell end table 

Jadi, besar sudut antara vektor a with rightwards arrow on top space dan space b with rightwards arrow on top adalah 83 comma 66 degree.

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