From the calculation using the values give, there is no possible angle for O
The sine rule
When working with non-right-angled triangles, the sine rule is especially helpful as it can be used to determine unknown sides or angles when certain other details are known. It can be used in many different contexts, such as resolving triangles or computing angles and distances in navigational issues.
From the sine rule we know that;
o/Sin O = n/Sin N
6.4/Sin O = 1.9/Sin 69
Sin O = 6.4 * Sin 69/ 1.9
O = There is no possible angle