Two points D and E lie on sides AB and AC respectively of ΔABC. Give the information that DE|| BC is not true through the values given in the following questions:

AD = 10.5 cm, BD = 4.5 cm, AC = 4.8 cm and AE = 2.8 cm.

Two points D and E lie on sides AB and AC respectively of ΔABC. Give the information that DE|| BC is not true through the values given in the following questions:

AB = 12 cm, AD = 8 cm, AE = 12 cm and AC = 18 cm.

Two points D and E lie on sides AB and AC respectively of ΔABC. Give the information that DE|| BC is not true through the values given in the following questions:

AB = 5.6 cm, AD = 1.4 cm, AC = 9.0 cm and AE = 1.8 cm.

Two points D and E lie on sides AB and AC respectively of ΔABC. Give the information that DE|| BC is not true through the values given in the following questions:

AD = 5.7 cm, BD = 9.5 cm, AE = 3.3 cm and EC = 5.5 cm.

In the given figure points L, M and N respectively lie on OA, OB and OC such that LM || AB and MN || BC. Then, show that LN || AC.