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The method will depend on what information you have, and the amount of knowledge expected of you. At the basic level, you should be able to reach an answer using the following facts:

1. The sum of the exterior angles is 360 degrees.

2. The sum of the interior angles is 360 degrees.

3. Each pair of exterior and interior angles adds to 180 degrees.

These will give equations that may be solved - individually or simultaneously (depending on your level).

If you are more advanced still, information about some of the angles may be missing but you may have side-lengths instead. Then it is a question of using the basic triginometric ratios to calculate the missing angles.

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Q: How do you find a missing angle in a quadrilateral with variables involved?
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