Create a circle centered at point A with a radius large enough for you to distinguish the two points where the circle intersects the two legs of ∠BAC. Label the points where the circle intersects ∠BAC as D and E.
Create two circles centered at points D and E with equal radii that are long enough to allow the circles to intersect.
There are two points where the circles intersect each other. Mark the point that is farthest from the vertex, and label it F.

you estimate that the angle of elevation to the top of the 86th floor (the observatory) is 82 .the total height of the building is another 123 meters above the 86th floor.

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step-by-step explanation:

total income = price of one ticket   *   number of tickets sold

  y                 =     4                                   x

so the equation is y=4x     with x≥0   because number of tickets sold can not be negative

thus the equation is a semi -line with an end point at

(0,0)

passing through :

x=1     y=4(1) = 4   so through (1,4)