In the given figure, ABCD is a square and ∠PQR = 90°. If PB = QC = DR, prove that(i) QB = RC,(ii) PQ

In the given figure, ABCD is a square and ∠PQR = 90°. If PB = QC = DR, prove that
(i) QB = RC,
(ii) PQ = QR,
(iii) QPR = 45°