Final answer:
To find the angle of elevation of the sun, we can use similar triangles to set up a proportion.
Step-by-step explanation:
To find the angle of elevation of the sun, we can use similar triangles. Let's call the height of Marey's shadow 'h', and the height of Marey 'x'. The height of the sun can be represented as 'y'.
Using the concept of similar triangles, we can set up the following proportion:
(x-h)/h = y/x
Substituting the given values, we get:
(5'2 - 2'9) / 2'9 = y/5'2
Simplifying, we find that y = 3.31.