In the given figure, AB || CD, CD || EF and y : z = 3 : 7, then x = ?
Let n be the common multiple.
Y + Z = 180
3n + 7n = 180
N =18
So, y = 3n = 54o
z = 7n = 126o
x = z (Pair of alternate angles)
So, x = 126o