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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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:Quote:
Originally Posted by mastermin346
Plug in the values you know and solve for sin(Q). Keep in mind that Q > 90°.