Question 481163
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi,
 y = x   Note: Isosoles rt triangles formed dropping down from a
 point of the line to  the x-axis.  
angle angle between the line and the x-axis is 45°
{{{drawing(300,300,   -6, 6, -6, 6, grid(1),
circle(2, 0,0.3),
circle(2, 2,0.3),
line(2,0,2,2),
graph( 300, 300, -6, 6, -6, 6,0,x))}}}