geometry
posted by Esi .
1. Triangle ABC has a 63.0degree angle at B, and side AC is 13.6 cm long. What is the diameter of the circle circumscribed about ABC?
2. And: Given any triangle ABC, with sides a, b, and c opposite angles A, B,
and C, respectively, what can be said about the three ratios a/sinA , b/sinB
, and c/sinC ? This result is known as the Law of Sines.

1. Side AC is also known as b, the side opposite angle B. Use the law of sines. The ratio b/sinB = 2R, where R is the radius of the circumscribed circle.
For a proof, see http://www.pballew.net/lawofsin.html
2. Those ratios are equal for any triangle. 
thank you