If you have two other angles, then add up those 2 and subtract that from 180. if you have all 3 sides then use the law of cosines: a squared = b squared + c squared - 2bc (cos A) If you have one angle and the 2 included sides, use the law of cosines as well. if you have an angle and the length of its opposite side, and the side opposite to the angle you want, then use the law of sines: sin A/ a = sin B/ b if you have the angle and the length of its opposite side and another angle, use the law of sines to figure out the unwanted angle anyway and then follow situation 1.
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you add them then subtract by 180 to find the unknown angle
If it's a triangle then: 180-sum of known angles = unknown angle
if the triangle has one right angle in it
Well the three angles in a triangle all add up to 180° so if you add the two known angles and take it away from 180 you'll get your unknown angle.