<PRE><B>Question 1169791</B>
.


To answer your first question, calculate the diagonal of the rectangular school yard and then

multiply the length of the diagonal by tan(17°).



To answer next questions, divide the found height of the tree  by the respective dimension of the school yard.


Then find the arctan of each ratio, using your calculator.



--------

You have all needed instructions.


Boldly go forward.




</PRE>