Find the length of the missing side of the triangle below.

option (4) is correct.

Step-by-step explanation:

Consider a triangle ABC with a, b and c are sides.  and A, B and C are angles. (Side a faces angle A,  side b faces angle B and  side c faces angle C)

According to Sine rule,

 ..........(1)

From the given triangle,

∠B = 79° , ∠C = 49°, c= 30 and b= x

We have find the value for x,

Consider the last two fractions of (1)

Substitute the values given,

On solving , we get x =39.02 (approx)

Thus, option (4) is correct