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Joe
Lv 4
Joe asked in Science & MathematicsMathematics · 4 years ago

What's the angle between vectors u=(7,-5) and v=(3,2)?

2 Answers

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  • cidyah
    Lv 7
    4 years ago
    Favorite Answer

    Follow the example.

    http://www.wikihow.com/Find-the-Angle-Between-Two-...

    ||u|*|v|| = (7*3 -5*2 ) = 11

    ||u| = sqrt( 7^2+(-5)^2 ) = sqrt(74)

    ||v|| = sqrt(3^2+2^2) = sqrt(13)

    angle = cos^-1(11 /(sqrt(74)sqrt(13))

    = 1.208 radians

    = 1.208 *180/pi = 69.21 degrees

    =

  • Como
    Lv 7
    4 years ago

    u • v = √74 √13 cos Ө

    11 / √962 = cos Ө

    Ө = 69 • 2 ⁰

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