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The question appears to relate to the angles of a triangle.

1) If angle 3 is acute then the other two angles can also be acute. In the case of an equilateral triangle all three angles are equal and acute.

2) If angle 3 is acute and one other angle is obtuse then the remaining angle is acute.

3) If angle 3 is acute and one other angle is a right angle then the remaining angle is acute.

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15y ago

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