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How to find sides of obtuse angled triangle and acute angled triangle if one angle and two sides are given. I don't know the sine or cosine rule.... So

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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

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.