Two right triangles share a side as follows. What is the area of triangle ACE?
AC = 8
∠CAE = 45º
∠C = arctan(6/8)
∠AEC = 180 - (∠CAE + ∠C)
CE = (sinCAE * 8) / sinAEC
EF = sinC * CE
You can do the rest.
+1694 
