Question

two adjacent angle of a rhombus are in the ratio 4 ratio 5 find the measure of all its angle

Answer 1

$4x + 5x = 180$
$9x = 180 \\ x = 20$
$4x = 4 \times 20 = 80 \\ 5x = 5 \times 20 = 100$
80, 100 ,80, 100