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Let U be the set of all triangles in a p...

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' ?

Text Solution

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Here, `U` is the set of all triangles.
`=>U = {`Set of all triangles`}`
`A` is the set of triangles with at least one angle different from `60^@`
`=>A = {`Set of all triangles other than equilateral triangles`}`
`:. A\' = U - A `
`=> A\' = {` Set of all equilateral triangles `}`.
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