In diamond ABCD, the point P and Q are on the edge AB and BC respectively, and AP = BQ. Try to judge the shape of △ PDQ and prove it

In diamond ABCD, the point P and Q are on the edge AB and BC respectively, and AP = BQ. Try to judge the shape of △ PDQ and prove it

A: △ PDQ is an equilateral triangle. It is proved that: ∵ quadrilateral ABCD is a rhombus, ∵ a = 60 °, ≌ ad = AB = BD, ≌ ADB = ≌ abd = ≌ CBD = ≌ DBC = 60 °, ∵ in △ bdq and △ ADP, ad = BD, DAP = ≌ dbqap = BQ, ≌ bdq ≌ ADP (SAS), ≌ DP = DQ, ≌ ADP = ≌ QDB, and ≂ ad