Two strips of cloth with width 1 overlap at an angle a as shown. Find the area of the overlap.

I swear I am missing something on this.

Rhombus Area is base x height

Height is 1

Let base = x

unknown angle a

So all I could come up with was:

$\displaystyle x = 1/sine (a)$

Which gave me the Area = A

$\displaystyle A = 1 * (1/Sine (a))$

I don't recall ever figuring out an area with so little information given before.