Maths!!

anyone else maths?!

anyway, wondering if point me in direction (read: don't want answer on plate) of solving (attached).

rcb 90-34=56, there have no idea go. thinking in cyclic quadrilateral opposite vertices add 180 degrees, of course ocda isn't cyclic.

once abc oad should easy, 360-(2abc)-137-72.

ideas?

 

attached files:

• 

  screen shot 2012-02-07 @ 21.42.39.png

  file size:

  60 kb

  views:

  261

all triangles add 180*

should out immensely...

 

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