Question 1003675
I have analyzed to be able to see part of the description.  I will explain the drawing I made instead of show it.


Horizontal segment 75 meters or units.  At the left is perpendicular segment of height n;  At the right is perpendicular segment of height y.  n corresponds to the nearby building, and y corresponds to the skyscraper.  The angle described 54 degrees is at the bottom of the nearby building with hypotenuse running to the top of the skyscraper.  The bottom of the skyscraper is the Right angle.


This forms the right triangle allowing you to find y, the skyscraper height.
{{{y/75=tan(54)}}}
{{{highlight(y=75*tan(54))}}}
{{{highlight(highlight(y=103.2))}}}, height of the skyscraper.




The next part is the find according to my description, the value for n.  The other tutor made a good drawing, otherwise difficult to describe in words.


Look at mananth's drawing.  SB + BR = y, using symbolism from both of us.  We found the value for y already.  If we find the value of SB, then we can find BR, and understand that n=BR.


See the right triangle, one leg of 75, the angle at the left being 45 degree.  
{{{SB/75=tan(45)}}}
.
.
{{{n=y-SB}}}
{{{n=y-75*tan(45)}}}