In each of the figures given below, AB || CD. Find the unknown angles, giving reasons.

(i)

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

(viii)

In each of the following figures AB || CD. Find the unknown angles, giving reasons.

(i)

(ii)

In the given figure, AB || CD || EF. Find x, y and z.

In the given figure, AB || CD || EF and AD || BE. Find x, y and z.