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Math Help - Solution of triangles

  1. #1
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    Solution of triangles

    in triangle ABC,given A=40 degree,a=8cm and a=6cm,find the length of c..
    someone please help by using the sine rule..
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  2. #2
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    Quote Originally Posted by mastermin346 View Post
    in triangle ABC,given A=40 degree,a=8cm and a=6cm(b=6cm),find the length of c..
    someone please help by using the sine rule..
    HI

    I guess there is a typo . See red.

    This is just a very basic application of the sine rule and it's very obvious . Just draw a triangle and you should be able to see.

    8/ sin 40 = 6/sin B

    Then the sum of angles of a triangle will tell you angle C .

    so now use the sine rule once again .

    8/sin 40 = c/ sin C

    OR you can use the cosine rule , its faster .

    8^2=6^2+c^2-2(6)(c)cos 40 .

    solve for c .
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