Question

# Which congruence criterion do you use in the following? (a) Given: AC = DF AB = DE BC = EF So, ΔABC ≅ ΔDEF (b) Given: ZX = RP RQ = ZY ∠PRQ = ∠XZY So, ΔPQR ≅ ΔXYZ (c) Given: ∠MLN = ∠FGH ∠NML = ∠GFH ML = FG So, ΔLMN ≅ ΔGFH (d) Given: EB = DB AE = BC ∠A = ∠C = 90° So, ΔABE ≅ ΔCDB

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Solution

## (a) SSS, as the sides of ΔABC are equal to the sides of ΔDEF. (b) SAS, as two sides and the angle included between these sides of ΔPQR are equal to two sides and the angle included between these sides of ΔXYZ. (c) ASA, as two angles and the side included between these angles of ΔLMN are equal to two angles and the side included between these angles of ΔGFH. (d) RHS, as in the given two right-angled triangles, one side and the hypotenuse are respectively equal.

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