Posted by haley on .
from the top of a bridge over the burlington canal, maria looks down at a sailboat at an angle of depression 15 degrees.the bridge is 18m above the water. calculate the horizontal distance from the bridge to the sailboat

math (trig) 
MathMate,
You are looking at a right triangle of which one angle is 15°, the opposite side is 18m (vertical).
From the definition of tangent,
tan(θ)=opposite (18m) / adjacent (H)
where H is the horizontal distance required.
Solve for H since θ and opposite are known.