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16 August, 19:33

If the smallest angle of a triangle is 20 degrees and it is included between sides of 4 and 7, then (to the nearest tenth) the smallest side of the triangle is 3.2 - true or false?

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  1. 16 August, 20:23
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    Hello,

    Al 'Kashi theorem says:

    a²=4²+7²-2*4*7*cos 20°=12.37721 ...

    ==>a=3.518126381 ... ≈3.5 = = >False.
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