Equilateral triangles have 3 sides of equal length, and 3 angles with measures of 60 degrees each.
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No.
In any right triangle, the two angles at either end of the hypotenuse are both always acute angles. But I don't think that would be called an 'acute' triangle, because an acute triangle is one in which all three angles are acute ones.
It doesn't matter if a triangle is isosceles, scalene, obtuse, acute... There are always 3 angles in a triangle (which add up to 180).
a triangle
Yes. A triangle can have only one obtuse angle. The other two angles will always be acute.