(a) isosceles  (b) right
Step-by-step explanation:
(a) All sides of a rhombus are congruent → PN = AN
  Therefore, ΔPNA has two congruent sides so is ISCOSCELES
(b) The diagonals of a rhombus are perpendicular (equal to 90°)
  Therefore, ∠PEL = 90° so ΔPEL is a RIGHT triangle