The answer depends on which variable is missing.
butty mutt
180 minus two known angles = unknown angle
The total of the three interior angles in a triangle is 180 degrees. if you know two of the angles, subtract them from 180 and that gives you the third angle.
That will depend on the shape but if it's a triangle then the missing angle is 54 because there are 180 degrees in a triangle.
The answer depends on which variable is missing.
butty mutt
The answer depends on what information you do have!
All the angles of a square are 90 degrees.
Subtract the two known angles from 180 degrees will give you the missing angle
The answer depends on what information you do have and what is missing. There is no single answer for all situations.
180 minus two known angles = unknown angle
to find missing angles you are dealing with complementry and suplementry angles. Suplementry angles add up to 180 degrees so you must subtract what given angle you have from 180 and you come up with youre missing angle. This rule also gos for complementry but the angles must add up to 90 degrees
take away the interior angle adjacent to it from 360
you add the three other angles and subtract that from 360
If you are trying to find the missing angle of a triangle you do 180 degrees minus your two other angles. However if you are trying to find the missing angle of a quadrilaterals you do the same thing but with 360 degrees.
the angles of a quadrilateral will add up to 360 degrees, so if you have the angles of the first three vertices, you can find the measure of the last one by subtracting the sum of all the other angles from 360.