Question

The angle of elevation of an object viewed is the angle formed by the line of sight with the horizontal when it is

• A. Above the horizontal level
  
• B. Below the horizontal level
  
• C. At the horizontal level
  
• D. None of the above

Answer 1

The correct option is A Above the horizontal level

In the figure, $AB$ is a vertical object with $A$ as foot and $B$ as top.

$P$ is the point of observation.

So, $PA$ is the line of horizontal sight and we have to raise our head if we look at $B$.

The angle, described in this case $=\angle PAB$ when $PB$ is the line of sight.

But by definition, $\angle APB$ is the angle of elevation.

Hence, option A is correct.