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Pertanyaan

Diketahui △ ABC dengan A ( 3 , 3 , − 2 ) , B ( 3 , 7 , 2 ) dan C ( − 1 , 7 , − 2 ) , tentukan besar sudut ABC.

Diketahui  dengan  dan , tentukan besar sudut ABC.

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E. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

Jawaban terverifikasi

Jawaban

besar sudut ABC adalah .

besar sudut ABC adalah begin mathsize 14px style 60 degree end style.

Pembahasan

1. Tentukan vektor 2. Tentukan vektor 3. Tentukan 4. Tentukan 5. Tentukan 6. Tentukan besar sudut antara vektor dan cos α = ∣ AB ∣ ∣ BC ∣ AB ⋅ BC ​ cos α = ∣4 2 ​ ∣ ∣4 2 ​ ∣ 16 ​ cos α = 32 16 ​ cos α = 2 1 ​ α = 6 0 ∘ Jadi, besar sudut ABC adalah .

1. Tentukan vektor begin mathsize 14px style AB with rightwards arrow on top end style

begin mathsize 14px style AB with rightwards arrow on top equals open parentheses table row 3 row 7 row 2 end table close parentheses minus open parentheses table row 3 row 3 row cell negative 2 end cell end table close parentheses AB with rightwards arrow on top equals open parentheses table row 0 row 4 row 4 end table close parentheses end style

2. Tentukan vektor begin mathsize 14px style BC with rightwards arrow on top end style

begin mathsize 14px style BC with rightwards arrow on top equals open parentheses table row cell negative 1 end cell row 7 row cell negative 2 end cell end table close parentheses minus open parentheses table row 3 row 7 row 2 end table close parentheses BC with rightwards arrow on top equals open parentheses table row cell negative 4 end cell row 0 row cell negative 4 end cell end table close parentheses end style

3. Tentukan begin mathsize 14px style AB with rightwards arrow on top times BC with rightwards arrow on top end style

begin mathsize 14px style AB with rightwards arrow on top times BC with rightwards arrow on top equals open parentheses table row 0 row 4 row 4 end table close parentheses times open parentheses table row cell negative 4 end cell row 0 row cell negative 4 end cell end table close parentheses AB with rightwards arrow on top times BC with rightwards arrow on top equals 0 plus 0 minus 16 AB with rightwards arrow on top times BC with rightwards arrow on top equals 16 end style

4. Tentukan begin mathsize 14px style open vertical bar AB with rightwards arrow on top close vertical bar end style

begin mathsize 14px style open vertical bar AB with rightwards arrow on top close vertical bar equals square root of 0 squared plus 4 squared plus 4 squared end root open vertical bar AB with rightwards arrow on top close vertical bar equals square root of 16 plus 16 end root open vertical bar AB with rightwards arrow on top close vertical bar equals 4 square root of 2 end style

5. Tentukan begin mathsize 14px style open vertical bar BC with rightwards arrow on top close vertical bar end style

begin mathsize 14px style open vertical bar BC with rightwards arrow on top close vertical bar equals square root of open parentheses negative 4 close parentheses squared plus 0 squared plus open parentheses negative 4 close parentheses squared end root open vertical bar BC with rightwards arrow on top close vertical bar equals square root of 16 plus 16 end root open vertical bar BC with rightwards arrow on top close vertical bar equals 4 square root of 2 end style

6. Tentukan besar sudut antara vektor begin mathsize 14px style AB with rightwards arrow on top end style dan begin mathsize 14px style BC with rightwards arrow on top end style

Jadi, besar sudut ABC adalah begin mathsize 14px style 60 degree end style.

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Calvin Stanley Limbong

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