90/2 = 45 degrees twices
These both are 45 degrees which is less than 90
34.76
o
, nearly.
Explanation:
Angle of elevation = arc tan( (vertical height)/(length os the shadow)).
Here, this angle is
arc tan (12.5
/
18) =
34.78
o
, nearly
N = N (1+0.20)^5
o
Here, that'd be 10000(1.20)^5, or 24883 trees.
38 meters long is the answer
