Question

In Triunghiul ABC , AB=4 , BC=7 , m(B)=45. Calculati aria triunghiului ABC.

Answer 1

$A=\frac{AB*BC*sinB}{2}=\frac{4*7*sin45}{2}=\frac{28*\frac{\sqrt{2}}{2} }{2}=7\sqrt{2}$