Question 843477
Looking from the east:
{{{drawing(400,300,-0.5,3.5,-0.2,2.8,
line(-0.5,0,3.5,0),red(line(0,0,3,2.588)),
rectangle(2.318,0,2.518,2),
locate(2.8,2.8,red(sunbeam)),locate(2.15,1,2m),
locate(1.5,0.2,shadow),locate(2.27,1.8,wall),
locate(0.2,0.27,40^o),locate(0.45,0.2,"47' "),
red(arc(0,0,1.5,1.5,-40.78,0))
)}}} {{{tan((40&47/60)^o)=2m/shadow}}}= approximately{{{0.86267}}}
{{{2m/shadow=0.86267}}}-->{{{shadow=2m/0.86267}}}= approximately{{{2.32m}}}
Looking from a helicopter hovering above the shadow of the wall
{{{drawing(400,300,-0.5,3.5,-0.2,2.8,
line(0,-0.2,0,2.8),rectangle(2.318,-0.5,2.518,3),
locate(2.27,1.8,wall),locate(1.1,0.98,2.32m),
arrow(1.16,1,0,1),arrow(1.16,1,2.32,1),
locate(1.05,1.2,shadow)
)}}} Area of shadow ={{{(2.32m)(60m)=highlight(139.2)}}}{{{m^2}}}