Question 857317
<pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
isosceles triangle has two equal side with a length of 8cm, its angle is 40 
 sin 20 = {{{opp/hyp = (b/2)/8}}}
   b = {{{16 sin (20)}}}
{{{drawing(300,300,   -30,30,-1,12,  
circle(24,0,0.4),
circle(-24,0,0.4),
circle (0, 10,0.4),
line(24,0,0,10),
line(-24,0,0,10),
line(0,0,0,10),
line(-24,0,24,0)
locate (-30, 5, "h")
)}}}