Can some please explain what I have to do to get the answer?

An airplane passes directly over Seneca
High School. A student at Cherokee High
School, which is 4.3 miles away, finds the
angle of elevation of the plane to be 19°.
Find the altitude of the plane.

2 answers

make a sketch to see that

tan 19° = height/4.3
height = 4.3tan19°
= ..
tan 19° = height/4.3 miles
h= 4.3 x tan 19°
h = 1.48 miles