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If you don't know the sine rule, it is very easy. Let me tell you the sine rule first.
See the figure. Note that side a is opposite to angle A, side b is opposite to angle B, side c is opposite to angle C.

The sine rule is  \frac{a}{sin A} = \frac{b}{sinB} = \frac{c}{sinC}

It works for both all types of triangles - acute, obtuse and right angled.
If one angle and two sides are given, let A, a and b are given.
First find B, then find C and then c.