Answer:
Explanation:
Two Angles are Supplementary when they add up to 180°.
x - the angle
We have the equation:
121° + x = 180° subtract 121° from both sides
121° - 121° + x = 180° - 121°
x = 59°
The supplementary angle of 121 is 59°
Supplementary, sum = 180°
so 180 - 21 = 59°
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