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Isosceles triangle - has two sides that are equal
Scalene triangle - no sides are equal
Equilateral triangle - all sides are equal
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According to angles:
1) Right triangle = with a 90-degree angle
2)  Acute triangle  = with distinct acute angles, but no right angle (acute angle measures less than 90 degrees)
3)  Obtuse Triangle = with one obtuse angle (angle whose measure is more than 90 degrees but less than 180 degrees) 
4)  Equiangular triangle =  all angles have equal measurements.

According to sides:
1)  Equilateral triangle = all sides are equal in measure.
2)  Isosceles triangle = Two sides are equal.
3)  Scalene triangle = each side has different measurement.
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