Question 1044400
{{{highlight(2m)}}} , of course.
 
{{{drawing(450,350,-0.25,4.25,-.25,3.25,
red(triangle(0,0,4,0,4,3)),red(rectangle(4,0,3.9,0.1)),
line(0.5,0.3,3.9,0.3),line(3.5,0.3,3.5,2.5),
triangle(1.5,0.3,3.5,0.3,3.5,1.7),rectangle(3.5,0.3,3.4,0.4),
locate(1.8,0,red(4)),locate(4.05,1.8,red(3)),locate(1.7,1.5,red(5)),
locate(2.5,1.9,wall),arrow(2.8,1.8,3.5,1.8),locate(0.6,0.3,ground),
locate(1.2,0.9,ladder),arrow(1.6,0.9,2.3,0.9),
locate(2.4,0.95,2.5),locate(3.15,1,1.5m),locate(2.4,0.45,x)
)}}} The level ground, the wall, and the ladder forms a 3-4-5 right triangle, with sides {{{1/2}}} as long as the red 3-4-5 triangle.