In the following figure, side BA of triangle ABC is extended upto D, and DE || CB. If ∠ADE=70∘ and ∠ACB=40∘, find the measure of ∠BAC.

In the following figure, side BA of triangle ABC is extended upto D, a

1.	In the following figure, side BA of triangle ABC is extended upto D, and DE \|\| CB. If ∠ADE=70∘ and ∠ACB=40∘, find the measure of ∠BAC.
Answer» In the following figure, side BA of triangle ABC is extended upto D, and DE \|\| CB. If $∠ A D E = 70^{\circ}$ and $∠ A C B = 40^{\circ}$ , find the measure of $∠ B A C .$