Aiko stands 5 m from a tree. At that distance, the angle of elevation from the ground to the top of the tree is 80°. Approximately how tall is the tree?

This is the concept of trigonometry, the height of the tree will be given by:

tan theta=[opposite]/[adjacent]

theta=80

height=h

adjacent=5 m

hence;

tan80=h/5

hence;

h=5tan80

h=28.36 m