1. Tardigrade
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  4. E, I, R, O denote respectively the sets of all equilateral, isosceles, right angled and obtuse angled triangles in a plane, then which of the following is not true.

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Q. $E, I, R, O$ denote respectively the sets of all equilateral, isosceles, right angled and obtuse angled triangles in a plane, then which of the following is not true.

Sets

Solution:

An equilateral triangle cannot be obtuse angled or right angled but is an isosceles triangle.
So $E \subset I$ and $E \cap I=E$.