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D ib er ikan ∣ a ∣ = 7 , ∣ b ∣ = 8 d an b es a r s u d u t an t a r a v e k t or a d an v e k t or b a d a l ah ∠ ( a , b ) = 6 0 o . P anjan g v e k t or ( a , + b ) a d a l ah ...

  1. 10

  2. 11

  3. 12

  4. 13

  5. 14

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F. Kurnia

Master Teacher

Mahasiswa/Alumni Universitas Jember

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Pembahasan

.  vertical line a with rightwards arrow on top plus b with rightwards arrow on top vertical line equals square root of vertical line a with rightwards arrow on top plus b with rightwards arrow on top vertical line end root equals square root of open parentheses a with rightwards arrow on top plus b with rightwards arrow on top close parentheses times open parentheses a with rightwards arrow on top plus b with rightwards arrow on top close parentheses end root equals square root of a with rightwards arrow on top times a with rightwards arrow on top plus a with rightwards arrow on top times b with rightwards arrow on top plus b with rightwards arrow on top times a with rightwards arrow on top plus b with rightwards arrow on top times b with rightwards arrow on top end root  space space space space space space space space space space space space space space equals square root of vertical line a with rightwards arrow on top vertical line squared plus 2 a with rightwards arrow on top times b with rightwards arrow on top plus vertical line b with rightwards arrow on top vertical line squared end root space equals square root of vertical line a with rightwards arrow on top vertical line squared plus 2 a with rightwards arrow on top times b with rightwards arrow on top plus vertical line b with rightwards arrow on top vertical line squared cos angle open parentheses a with rightwards arrow on top comma b with rightwards arrow on top close parentheses plus vertical line b with rightwards arrow on top vertical line squared end root  space space space space space space space space space space space space space space equals square root of left parenthesis 7 right parenthesis squared plus 2 left parenthesis 7 right parenthesis left parenthesis 8 right parenthesis cos 60 to the power of o plus left parenthesis 8 right parenthesis squared end root space equals square root of 49 plus 2 left parenthesis 7 right parenthesis left parenthesis 8 right parenthesis 1 half plus 64 end root  space space space space space space space space space space space space space space space space space space equals square root of 49 plus 56 plus 64 end root equals square root of 169 equals 13

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Diketahui koordinat A ( − 1 , 2 , 3 ) , B ( 4 , − 5 , 0 ) , dan C ( − 2 , − 1 , 3 ) . Jika a , b , dan c merupakan vektor posisi dari A , B , dan C , tentukan : d. cosinus sudut antara vektor ( 2 a...

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