Question 918179
<pre>
{{{drawing(400,290,-10,110,-10,77,

line(0,0,100.5034277,0),line(100.5034277,0,67.70882991,32.25700471),
line(0,0,67.70882991,32.25700471), locate(31,22.4,75),
locate(83,22,46), red(arc(67.70882991,32.25700471,25,-25,205,315)),
locate(62,27,"110°"),locate(50,0,x)

 )}}}

{{{matrix(1,9,


(matrix(2,1,THIRD,SIDE))^2,
"",
""="",
"",
(matrix(2,1,FIRST,SIDE))^2,
""+"",
(matrix(2,1,SECOND,SIDE))^2,
""-"",
2*(matrix(2,1,FIRST,SIDE))*(matrix(2,1,SECOND,SIDE))*(matrix(5,1,COSINE,OF,ANGLE,BETWEEN,THEM))) }}}

<font size = 4><b>
      x<sup>2</sup> = 75<sup>2</sup> + 46<sup>2</sup> - 2*75*46*cos(110°)

      x<sup>2</sup> = 5625 + 2116 - 6900*(-0.3420201433)

      x<sup>2</sup> = 7741 + 2359.938989

      x<sup>2</sup> = 10100.93898

      x = 100.5034277"
</b></font>
Edwin</pre>