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The figure below shows a triangle PQR in which PQ=8cm and angle QPR=1000 and angle PQR=350.Calculate to 2 decimal places the length of QR and hence the area of triangle PQR to2 decimal places.

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MathF4pp2Q6
    QR    =     8     
Sin 100     sin 35º
QR=8 sin 100º= 13.74cm  
                          Sin 35o
Area = ½x13.74 x 8 sin 45º 
=38.86cm2

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