With only one number, you cannot - unless that one number happens to be the measure of the missing angle!
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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.
Subtract the two known angles from 180 degrees will give you the missing angle
To find the measure of an angle, you need to know the size of the entire angle and the other angles within the angle. Then, you subtract the smaller, known angles from the entire, large angle and you should get the measure of the missing angle.
That will depend on how many sides the polygon has.
need to find the missing number 8(7+23)=8(7)+8( )