When the length of a tree's shadow is three times its height, the sun's angle of elevation is
A. 30°
B. 45°
C. .60°
D. .90°
Answer:A
When the length of a tree's shadow is three times its height, the sun's angle of elevation is
A. 30° B. 45° C. .60° D. .90°
Explanation: Assume that AB represents the tree and AC represents its shadow.Let's say ACB = THETA.After that, AC/AB = ROOT 3 cot = ROOT 3= 30 degrees.