Respuesta :

irspow
tan42°=a/14

a=14tan42°

a≈12.61 (to the nearest hundredth of a unit)
You have to use tangent (ratio of sine and cosine).

Use tangent to find the opposite to the adjacent side (14) from the angle (in this case a).

a = 14*tan(42°) = 14*0,9 = 12,6 (approssimatively)