Ben and Kara are both looking at the top of a tower in the distance in the same line of sight, although Kara is 100 m ahead of Ben. Ben observes the tower at an angle 16 degrees of with the ground. If the top of the tower is 800 m from Kara, what is Kara’s angle of sight with the ground?

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

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