Question 1074003
From middle of the screen to top of the screen is {{{15/2}}} meters.

{{{h^2=(15/2)^2+40^2}}}


{{{h=sqrt((15/2)^2+40^2)}}}


Question asks for {{{h-40}}}

{{{sqrt(7.5^2+40^2)-40}}}

{{{40.697-40}}}


{{{0.7}}}, about 0.7 meters difference