Question 427379
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b>
Hi
area(triangle) = (1/2)b*h = (1/2)9cm*12cm = 54 cm^2

{{{drawing(400,400,-2,15,-2,15,
line(0,0,9,0), locate(-.3,0,A), locate(9,0,B), locate(0,12.5,C), 
line(9,0,0,12), locate(4.5,0,9), locate(5.5,6.5,15), locate(-.8,6,12),

line(0,0,0,12))  )}}}