1.

The lengths of sides of triangles shown in the following figures. Using SSS condition of congruency find which of the pairs are congruent, in condition of congruency, write in symbolic form.

Answer»

(i) In ∆ABC and ∆PQR

AB = PQ= 1.5 cm
BC = QR = 2.5 cm
CA = RP = 2.2 cm
By S.S.S. condition of congruency ∆ABC ≅ ∆PQR

(ii) In ∆DEF and ∆LMN , EF ≠ MN

∴ These triangles are not congruent.

(iii) In ∆ABC and ∆PQR

BC ≠ QR

∴ These triangles are not congruent.

(iv) In ∆ADB and ∆ADC

AD = AD (common)
DB = DC = 2.5 cm
and BA = CA = 3.5 cm

In S.S.S. condition of congruency , ∆ADB ≅ ∆ADC.



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