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Math Help - SSA when the angle isn't between the sides - find the third side.

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    SSA when the angle isn't between the sides - find the third side.

    Angle B is the obtuse angle in a triangle with the following measures. a=12, b=21, A=25 degrees. Find length c.

    Not sure because have two sides, but not the angle between them.

    GOT IT: Angle B comes out to 44.7, but since it's obtuse it's 180-44.7 = 132.3
    Last edited by fcabanski; May 26th 2012 at 09:30 AM.
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    Re: SSA when the angle isn't between the sides - find the third side.

    Quote Originally Posted by fcabanski View Post
    Angle B is the obtuse angle in a triangle with the following measures. a=12, b=21, A=25 degrees. Find length c.

    Not sure because have two sides, but not the angle between them.

    GOT IT: Angle B comes out to 44.7, but since it's obtuse it's 180-44.7 = 132.3
    Use the sine rule to find angle B, then you will have two angles of the triangle, which is enough to find the third, then solve for side c using either the sine or cosine rules.
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