Question 672315
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
C(-4,0)
A(-2,4)  m = -4/-2 = 2
B(6,0)
A(-2,4)  m = -4/8 = -1/2
CA is perpendicular to BA, Yes ABC is a right triangle
{{{drawing(300,300,   -6, 6, -6, 6,  grid(1),
circle(-2, 4,0.3),
circle(6, 0,0.3),
circle(-4, 0,0.3),
line(6,0,-2,4),
line(-4,0,-2,4),
graph( 300, 300, -6, 6, -6, 6))}}}