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

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^prime` ?

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Here, U is the set of all triangles.
A is the set of all triangles with at least one angle different from `60^@`.
So, there can be one angle, two angles or three angles that can not be `60^@`
Thus, `A'` = `U - A`
So,`A'` will be a set of triangle that contains all angles with `60^@` that means set of all equilateral triangles.
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