If it's a quadrilateral then the other 3 angles must add up to 335 degrees because a 4 sided quadrilateral contains 360 degrees
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A triangle with interior angles of 42, 87 and 24 degrees doesn't exist because the angles add up to 153 degrees whereas the interior angles of any triangle always add up to 180 degrees.
Supplementary angles are angles that add up to 180 degrees, ie. a straight angle. Therefore, the angle supplementary to 101 degrees would be 180-101=79 degrees.
121 degrees is an obtuse angle because it is greater than 90 but less than 180 degrees
The sum of two supplementary angle equals 180 degrees.
The missing angle measure is 100 degrees.