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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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To solve the problem, we need to find the complement of the set A, denoted as A'. ### Step-by-Step Solution: 1. **Understand 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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