Question 890000
{{{drawing(400,250,-2,38,-5,20,
line(0,0,29,0),
green(arrow(0,0,36.2,15.63)),
red(arc(29,0,24.4,24.4,-150,-70)),
red(line(29,0,28.737,12.1972)),
red(line(29,0,20.338,8.591)),
locate(-0.5,0,A),locate(29,0,B),
locate(19.5,11,red("C ?")),
locate(28,14,red("C ?")),
locate(14,0,c=29cm),locate(29,7,red(a=12.2cm)),
locate(5,2.58,green(23^o)),green(arc(0,0,9.8,9.8,-23,0))
)}}}