Which of the following pairs of triangles are congruent ? In each case, state the condition of congruency :
(a) In `Delta ABC and Delta DEF`, AB = DE, BC = EF and `angle B = angle E`.
(b) In `Delta ABC and Delta DEF, angle B = angle E = 90^(@)`, AC = DF and BC = EF.
(c) In `Delta ABC and Delta QRP`, AB = QR, `angle B = angle R and angle C = angle P`.
(d) In `Delta ABC and Delta PQR`, AB = PQ, AC = PR and BC = QR.
(e) In `Delta ABC and Delta PQR`, BC = QR, `angle A = 90^(@), angle C = angle R = 40^(@) and angle Q = 50^(@)`.

Answer

All (a) By SAS
(b) By RHS
(c) By ASA or AAS
(d) By SSS
(e) By ASA