If you know the length of two sides and the angle between them, then you can use the cosine formula to work out the remaining side. Otherwise, the sine formula or Pythagorean theorem can be used.
How do I know when to use sine or cosine formula when given two degrees and one length?
What is the maximum and minimum value for the sine of an angle?
How do I find the value if all three sides of a scalene triangle are unknown?
Which formula is used when given 90-degree triangle, opposite angle is 26 degrees and one leg is know?
What rule would be used to find the length of sides if all three angles are known?
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