Triangle question

Hey all,

I am new to this forum and dont know if this is the place to be to ask.

But i need help with a reasonable easy math problem. I am trying different stuff but cant figutre it out.

Any help would be appreciated.

Well ok here goes :

Triangle ABC

With A-B = 50mtr
And C laying on the other side of a river. The question is how big is the river from shore to shore.

Corner from BAC = 52 degrees
And Corner ABC = 68 degrees.

My answer came on : 63.98 meters.

Many thanks in advance,

Mark