Show that the relation `R` defined on the set `A` of all triangles in a plane as `R={(T_1,\ T_2): T_1` is similar to `T_2)` is an equivalence relation. Consider three right angle triangle `T_1` with sides `3,\ 4,\ 5;` `T_2` with sides `5,\ 12 ,\ 13` and `T_3` with sides 6, 8, 10. Which triangles among `T_1,\ T_2` and `T_3` are related?

Explanation

`R={(T_{1}, T_{2}): T_{1}.` is similar to `T_{2}}`.



Check reflexive



Since every triangle is similar to itself



Triangle `T` is similar to triangle `T`



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