Question

At certain a certain time of the day a post, 4m tall casts a shadow of 1.8m. What is the angle of elevation of the sun at that time?

Answer 1

Call x the angle made by the sunlight direction and the earth horizontal. It is called angle of elevation of the sun.
tan x = tall/shadow

Explanation:

#tan x = 4/(1.8) = 2.22

Calculator gives--> x = 65.77 # deg

Angle of elevation x = 65.77 deg