Question 664922
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
two chimneys 18m and 13m high stand upright, 12m apart
the 'red line' distance below is :   {{{sqrt(12^2 + 5^2) = 13m}}}
{{{drawing(300,300,  -20,20,-20,20, grid(1),
circle(2, 13,0.3),
line(2,0,2,13),
circle(14, 18,0.3),
line(14,0,14,18),
red(line(2,13,14,18)),
graph( 300, 300, -20,20,-20,20))}}}