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First: Sides are not acute or obtuse. ANGLES are acute or obtuse.

An acute triangle has to have all angles acute. Examples:

60, 60, 60

70, 60, 50

45, 50, 85

45, 45. 90

30, 60, 90

But if one of the angles is obtuse (>90 degrees), then the other two must be acute. Of course, *this* triangle would not be called an acute triangle, because one of its angles is abtuse; it would be called an obtuse triangle.

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Q: How many acute sides does an acute triangle have?
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