Question 1156149
{{{drawing(400,160,-2,28,-2,10,

line(0,0,25.95925156,0), line(25.95925156,0,6.172803957,7.611602414),
line(0,0,6.172803957,7.611602414), locate(5.5,7.3,108^o),
red(arc(6.172803957,7.611602414,6,-6,230,339)),
locate(13,6,21.2),


locate(0,0,Z), locate(25.9,0,Y),locate(6,8.7,X), locate(1.2,4.7,9.8)

  )}}}

{{{matrix(5,3,
ZY^2,""="",ZX^2+YX^2-2(ZX)(YX)*cos(X),
ZY^2,""="",9.8^2+21.2^2-2(9.8)*(21.2)*cos(108^o),
ZY^2,""="",673.8827415,
ZY,""="",sqrt(673.8827415),
ZY,""="",25.95925156)}}} 

Edwin</pre>