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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'`?

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To solve the problem, we need to determine the complement of the set \( A \) in the universal set \( U \). ### Step-by-Step Solution: 1. **Identify the Universal Set \( U \)**: - The universal set \( U \) is defined as the set of all triangles in a plane. 2. **Define the Set \( A \)**: ...
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