Answer:
f = 14.26 m (2 dp)
Step-by-step explanation:
Sum of interior angles of triangle = 180°
⇒ missing angle = 180 - 40 - 90 = 50°
Using sin(A)/a = sin(B)/b = sin(C)/c
⇒ sin(40)/f = sin(50)/17
⇒ 17sin(40) = f sin(50)
⇒ 17sin(40) ÷ sin(50) = f
⇒ f = 14.26 m (2 dp)
