Question

two adjacent angles of a parallelogram are in the ratio 4 is to 5 find the measure of each of its angles

Answer 1

let the two angles be 4x and 5x 
therefore,
    a/q, 4x+5x=180{adjacent angles are supplementary}
                 9x=180
                   x=180/9
                   x=20
  therefore measure of each angle is 80, 100, 80, 100

Answer 2

4x+5x=180 adjacent angles
9x=180
x=180/9
x=20
there fore answer is 80 and 1000