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# Q.1 Which congruence criterion do you use in the following? (a) Given: AC = DF AB = DE BC = EF So, $$\triangle ABC \cong \triangle DEF$$ (b) Given: ZX = RP RQ = ZY $$\angle PRQ = \angle XZY$$ So, $$\triangle PQR \cong \triangle XYZ$$ (c) Given: $$\angle MLN = \angle FGH$$ $$\angle NML = \angle GFH$$ ML = FG So, $$\triangle LMN \cong \triangle GFH$$ (d) Given: EB = DB AE = BC $$\angle A = \angle C = 90°$$ So, $$\triangle ABE \cong \triangle CDB$$

(a) $$\triangle ABC \cong \triangle DEF$$ (BY SSS rule)
(b) $$\triangle PQR \cong \triangle XYZ$$ (BY SAS rule)
(c) $$\triangle LMN \cong \triangle GFH$$ (BY ASA rule)
(d) $$\triangle ABE \cong \triangle CDB$$ (BY RHS rule)