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25 October, 01:37

Suppose a triangle has two sides of length 2 and 3 and that angle between these two sides is 60 degrees. What is the length of the third side

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  1. 25 October, 01:55
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    Apply cosine rule:

    c²=b²+a²-2ba cosC

    C = pi/3 = 180/3 = 60 degrees

    cosine 60 deg = 0.5

    c²=2²+3²-[2*2*3*0.5]

    c²=7

    c=√7

    c=2.645; length of third side of angle
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