Yes, the triangles are similar. How can you prove this? (one way would be to find 2 sets of congruent angles)
Now that we know the triangles are similar, let's try and find the ratio of similarity. We could try and compare the bases of the triangles, the altitudes (the "right" sides) or the hypotenuses (the "left" sides). Which do we know the most about? (Hint: if AB = BC = CD, what does that say about BD and AD?)
Finally, yes, there is a property regarding similar triangles and their areas. See if you can deduce what it is - in this case you know how big the base and height of each triangle are in proportion to each other, so it should be easy to figure this out.