Class 11th Maths Textbook Chapter 1: Sets Exercise 5: Complement of a Set Question 6 Solution

Question

Let U be the set of all triangles in a plane. If A is the set of all triangles with at least one angle different from 60°, what is A'?

Accepted Answer

Find the complement of set A by finding the elements of set U that are not elements of set A.
 {green}	extbf{Answer: Set of all equilateral{math_tip:def_equilateral_triangle} triangles.}|||	extbf{Reason: Triangles either have all angles equal to 60° or at least one angle different from 60°. Therefore, after removing the triangles with at least one angle different from 60°, only equilateral triangles remain.}{/green}

Question: 6

Answer