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Besar sudut yang terbentuk antara vektor p ​ = ⎝ ⎛ ​ 2 3 − 1 ​ ⎠ ⎞ ​ dan q ​ = ⎝ ⎛ ​ 4 − 2 2 ​ ⎠ ⎞ ​ adalah...

Besar sudut yang terbentuk antara vektor  dan  adalah...

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E. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

Jawaban terverifikasi

Jawaban

besar sudut antara vektor tersebut adalah .

besar sudut antara vektor tersebut adalah 90 degree.

Pembahasan

Menentukan Menentukan dan Menentukan besar sudut Jadi, besar sudut antara vektor tersebut adalah .

Menentukan p with rightwards arrow on top times q with rightwards arrow on top  

 table attributes columnalign right center left columnspacing 0px end attributes row cell p with rightwards arrow on top times q with rightwards arrow on top end cell equals cell left parenthesis 2 cross times 4 right parenthesis plus left parenthesis 3 cross times left parenthesis negative 2 right parenthesis right parenthesis plus left parenthesis left parenthesis negative 1 right parenthesis cross times 2 right parenthesis end cell row blank equals cell 8 minus 6 minus 2 end cell row blank equals 0 end table 

Menentukan vertical line p with rightwards arrow on top vertical line dan  vertical line q with rightwards arrow on top vertical line

table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line p with rightwards arrow on top vertical line end cell equals cell square root of 2 squared plus 3 squared plus left parenthesis negative 1 right parenthesis squared end root end cell row blank equals cell square root of 4 plus 9 plus 1 end root end cell row blank equals cell square root of 14 end cell row cell vertical line q with rightwards arrow on top vertical line end cell equals cell square root of 4 squared plus left parenthesis negative 2 right parenthesis squared plus 2 to the power of 2 end exponent end root end cell row blank equals cell square root of 16 plus 4 plus 4 end root end cell row blank equals cell square root of 24 end cell end table  

Menentukan besar sudut 

table attributes columnalign right center left columnspacing 0px end attributes row cell cos space alpha end cell equals cell fraction numerator p with rightwards arrow on top times q with rightwards arrow on top over denominator vertical line p with rightwards arrow on top vertical line vertical line q with rightwards arrow on top vertical line end fraction end cell row cell cos space alpha end cell equals cell fraction numerator 0 over denominator square root of 14 cross times square root of 24 end fraction end cell row cell cos space alpha end cell equals 0 row alpha equals cell arc space cos space 0 end cell row alpha equals cell 90 degree end cell end table  

Jadi, besar sudut antara vektor tersebut adalah 90 degree.

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