1.Relation and Function
easy

मान लीजिए कि $T$ किसी समतल में स्थित समस्त त्रिभुजों का एक समुच्चय है। समुच्चय $T$ में $R =\left\{\left( T _{1}, T _{2}\right): T _{1}, T _{2}\right.$ के सर्वागंसम है $\}$ एक संबंध है। सिद्ध कीजिए कि $R$ एक तुल्यता
संबंध है।

Option A
Option B
Option C
Option D

Solution

$\mathrm{R}$ is reflexive, since every triangle is congruent to it self.

Further, $\left( \mathrm{T} _{1}, \,\mathrm{T}_{2}\right) \in \mathrm{R} \Rightarrow \mathrm{T} _{1}$ is congruent to $\mathrm{T} _{2} \Rightarrow \mathrm{T} _{2}$ is congruent to $\mathrm{T} _{1} \Rightarrow\left( \mathrm{T} _{2}, \mathrm{T} _{1}\right) \in \mathrm{R} .$

Hence, $\mathrm{R}$ is symmetric.

Moreover, $\left( \mathrm{T} _{1},\, \mathrm{T} _{2}\right),\left( \mathrm{T} _{2}, \,\mathrm{T} _{3}\right) \in \mathrm{R} \Rightarrow \mathrm{T} _{1}$ is congruent to $\mathrm{T} _{2}$ and $\mathrm{T} _{2}$ is congruent to $\mathrm{T} _{3} \Rightarrow \mathrm{T} _{1}$ is congruent to $\mathrm{T} _{3} \Rightarrow\left( \mathrm{T} _{1}, \,\mathrm{T} _{3}\right) \in \mathrm{R}$.

Therefore, $\mathrm{R}$ is an equivalence relation.

Standard 12
Mathematics

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