Question

Angle a = angle b and ad=be.Show that de is parallel to ab

Answer 1

Answer:

This will form an isoceles triangle

And by BPT theorem we can prove that de=ab

Angle a=b

Ad=be

Triangles ABC ~dec

Therefore angle angle a=d=b=e

So ab is proportional to de

But as c is common in both the triangle

Thus by all these we conclude that ab||de