Question 280562
Solving for the altitude:
sine(teta)=opposite(a)/hypotenuse(b)

Substitute the given:(for a distance of 1km)
sin20=a/1000m
By cross multiplication
we get;
a=1000sin20
a=342.02 meters

Substitute the given:(for a distance of 50m)
sin20=a/50m
By cross multiplication
we get;
a=50sin20
a=17.101 meters