P is a point on side BC of triangle ABC such that AB=AP. THrough A and C, lines are drawn to BC and PA, so as to intersect at D as shown. Show that ABCD is a cyclis quadrilateral.

Put the parts in order to form a sentence. When you think your answer is correct, click on "Check" to check your answer. If you get stuck, click on "Hint" to find out the next correct part.