Can a pair of adjacent corners consist of acute and right angles?

Adjacent angles are two angles that add up to an expanded angle of 180 °. If one of the adjacent angles is straight (equal to 90 °), then the second angle will also always be right (180 ° – 90 ° = 90 °). Therefore, a pair of adjacent corners cannot consist of one right angle and one acute angle. There are only two possible options for the composition of a pair of adjacent corners:
1) Two right angles;
2) Acute angle and obtuse angle.