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4 March, 07:43

A triangle has side lengths of 11 inches, 15 inches, and 20 inches. Find the angle measures of the triangle. Round decimal answers to the nearest tenth.

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  1. 4 March, 08:06
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    I don't know but I have the equations. (also Im going to assume you know a bit of trig)

    Step-by-step explanation:

    You have to use law of cosines.

    a=11

    b=15

    take these equations and plug in the variables

    a^2=b^2+c^2-2bc cos (a)

    b^2=a^2+c^2-2ac cos (b)

    c^2=a^2+b^2-2ab cos (c)

    you will get something along the lines of

    something=cos a

    something=cos b

    something=cos c

    then in a calculator you push inverse cos or cos-1 (x) and input the "something" into as x and that answer should be one angle, and repeat it for the rest of the three values.
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