Based on the fact that the sum of the interior angles need to be equal to 180°, the missing angle is 110°
The sum of all the interior angles need to add up to 180° which means that to find the missing angle, you should subtract the known angles from 180°.
The missing angle is:
= Total angle - Known angles
Solving for the missing angle gives:
= 180 - 21 - 49
= 180 - 70
= 110°
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