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Math Help - Solution of triangles problem

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    Solution of triangles problem

    given triangle pqr where pqr is an obtuse angle.given that qr=10.5cm,pq=8cm and the area of pqr is 21 cm^2.find degree of q..
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    Quote Originally Posted by mastermin346 View Post
    given triangle pqr where pqr is an obtuse angle.given that qr=10.5cm,pq=8cm and the area of pqr is 21 cm^2.find degree of q..
    The area of the triangle PQR is calculated by:

    a = \dfrac12 \cdot |\overline{PQ}| \cdot |\overline{PR}| \cdot \sin(Q)

    Plug in the values you know and solve for sin(Q). Keep in mind that Q > 90.
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