Grafique la circunferencia canonica de centro (0,0)
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Answer:
86.63 ft
Step-by-step explanation:
The tangent relation applies.
Tan = Opposite/Adjacent
tan(77°) = (tree height)/(20 ft)
tree height = (20 ft)·tan(77°) ≈ 86.63 ft
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<em>Additional comment</em>
It is somewhat problematic for Bob to see the top of a white pine tree at that angle of elevation. His view would likely be obscured by the branches of the tree.
Since the given line
has slope
The equation of the line perpendicular to it must have a slope which is the negative reciprocal of ,
The slope of the perpendicular line
Using the slope intercept form,
We substitute
This implies that,
Since
lies on this line , it must satisfy its equation.
That is
This implies that
The line therefore has equation,
has slope
The equation of the line perpendicular to it must have a slope which is the negative reciprocal of ,
The slope of the perpendicular line
Using the slope intercept form,
We substitute
This implies that,
Since
lies on this line , it must satisfy its equation.
That is
This implies that
The line therefore has equation,