A polygon that has 3 sides 2 of which are of equal length and 3 interior angles 2 of which are of equal measure.
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equilateral triangle , isosceles triangle , scalene triangle
isosceles triangle
Are isosceles triangle sometimes an equilateral triangle
An obtuse triangle is not necessarily isosceles, but it can be.
No. An isosceles right triangle is a special case. There are many right triangles which are not isosceles.