Thus, the sum of any two adjacent angles of a parallelogram is 180°. Hence, any two adjacent angles of a parallelogram are supplementary.Click to see full answer. Beside this, what is the sum of adjacent angles in a parallelogram?The measures of the adjacent angles of a parallelogram add up to be 180 degrees, or they are supplementary.Also Know, are the adjacent angles of a parallelogram equal? “The given condition is the two adjacent angles of parallelogram are equal. It is because of the co-interior when parallelogram has opposite sides parallel. Hence, we can take the angle as x. Also asked, what is the sum of two adjacent angles? The adjacent angles will have the common side and the common vertex. Two angles are said to be supplementary angles if the sum of both the angles is 180 degrees. If the two supplementary angles are adjacent to each other then they are called linear pair. Sum of two adjacent supplementary angles = 180o.What is the sum of adjacent angles of rhombus?This means that they cut each other in half. Adjacent sides (ones next to each other) of a rhombus are supplementary. This means that their measures add up to 180 degrees.