Isosceles is a type of triangle that has at least two sides and two angles equal. An acute isosceles has one angle less than 90 degrees.
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It is possible for an isosceles triangle to be an acute triangle because, in an acute triangle all the angles have to be less than 90o.
Equilateral, Isosceles or Scalene. For the latter two they could be acute or right angled
there is 1 line of simmetry An equilateral triangle has three. An acute isosceles has one and an acute scalene has none.
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Not every acute triangle has two congruent sides, although some do, in which case they are called isosceles triangles.