Question

an airplane is sighted at angles of 74 and 78 degrees by two observers 1km apart. how high is the plane?

Answer 1

angles on a line\[180-78=102\]

angle opposite 1km
180 - 78 -102 = 4

find \[\frac{ \sin4 }{ 1 }= \frac{ \sin102 }{ ? }\]
x= 15.9

fine height\[h = \sin74(15.9)\]
\[=14.6\]