Help with a geometry question

I was wondering if anyone could

1)Check my interpretation/drawing of the question

2)Help me solve it

Here is the question:

*A circle with centre P circumscribes triangle ABC (ie: touches each vertex). In the triangle: ***Angle A**=75o and **Angle B=**60o. Construct tangents at points A and B, and extend them to intersect at D-outside the circle.

*Show that ABD is an isosceles triangle with a right angle at D.*

*(Hint: you may need to construct some extra lines within triangle ABC)*

Here is what I believe is described in the first paragraph:

IMG_0007.jpg picture by alexandersaver - Photobucket

Could anyone help me solve this( as well as where I would put the xtra lines)

Thanks