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..
Follow Math Help Forum on Facebook and Google+
Originally Posted by mastermin346 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: $\displaystyle a = \dfrac12 \cdot |\overline{PQ}| \cdot |\overline{PR}| \cdot \sin(Q)$ Plug in the values you know and solve for sin(Q). Keep in mind that Q > 90°.
View Tag Cloud