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7 February, 12:22

Use the law of cosines to find the value of 2*4*5 cos theta

a. 20

b. 40

c. - 40

d. 37

my answer is b

+3
Answers (1)
  1. 7 February, 12:33
    0
    We can proceed in solving the problem since all information are given such as 2*4*5costheta.

    we have a=4, b=5, and C=theta

    let us solve for "c" using Pythagorean

    c²=a²+b²

    c²=4²+5²

    c=6.4

    Solving for theta or C

    c²=a²+b²-2abcosC

    6.4²=4²+5²-2*4*5*cosC

    C=90
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