Yes.
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Supplementary angles are two angles whose measures add to 180 degrees. Adjacent angles are two angles that happen to lie next to each other, so that they combine to form a larger angle whose measure is the sum of the measures of the adjacent angles. Angles may be both adjacent and supplementary, in which case they will form a straight angle.
Yes, as for example 78 degrees and 102 degrees would form a supplementary angle of 180 degrees.
Perpendicular.
Any triangle with one angle in the range (90, 180) degrees and the other two angles adding up to its supplement will form an obtuse triangle.
a lozenge 4 angle two diagonal angle form and obtuse angle and the total are 180 degrees.