Question

answer the question​

Answer 1

Answer:

angle BCD = 20°+ 20° = 40°

angle ABC = 40°

Since alternative interior angles are equal.

therefore AB || CD ........ (1)

produce EF to X

then angle XEC = 180° -160° = 20°

angle BCD =angle XEC

since alternative interior angles are equal.

therefore EF|| CD ..... (2)

AB || EF