Question

what is the meaning of the term \angle of elevation\?
choose the correct answer below.
a. if b is a point above point a, as shown in the figure, then the angle of elevation from a to b is the acute angle formed by the horizontal line through a and the line of sight from a to b.
b. if b is a point above point a, as shown in the figure, then the angle of elevation from a to b is the obtuse angle formed by the horizontal line through a and the line of sight from a to b.
c. if b is a point above point a, as shown in the figure, then the angle of elevation from a to b is the acute angle formed by the vertical line through a and the line of sight from a to b.
d. if b is a point above point a, as shown in the figure, then the angle of elevation from a to b is the acute angle formed by the horizontal line through b and the line of sight from a to b.

Explanation:

The angle of elevation is defined as the acute angle formed by the horizontal line through the observer's position (point A here) and the line of sight from the observer to a point above (point B). It is not an obtuse - angle, and the horizontal line is through the observer's position, not the higher point.

Answer:

A. If B is a point above point A, as shown in the figure, then the angle of elevation from A to B is the acute angle formed by the horizontal line through A and the line of sight from A to B.