# A triangle has sides A,B, and C. If the angle between sides A and B is #(2pi)/3#, the angle between sides B and C is #pi/4#, and the length of B is 13, what is the area of the triangle?

##### 1 Answer

Feb 16, 2016

(169

#### Explanation:

Using lower case letters a, b and c for angles and a + b + c =

.with a =

Using B/sin(b) = A/sin(a), A = 13 sin(

Using, area = base X altitude / 2, the answer is B X A X sin (c) / 2.