if there was a triangle with one angel having 90° and the other having 142°.. what would the third angle be?

The sum of the interior angles of a triangle is always 180°.

So, if one angle is 90° and another angle is 142°, the third angle can be calculated as follows:

Third angle = 180° - (90° + 142°)
= 180° - 232°
= -52°

Since the third angle cannot be negative, it is not possible to have a triangle with angles measuring 90°, 142°, and -52°. This means that the given measurements do not form a valid triangle.