An isosceles triangle has two equal sides (and a third that is a different measure). It can also be identified by the fact that it has two equal angles and the third is different.
The above also mean that two of the three altitudes, medians, etc are equal while the third is different.
If the third measure is not different the triangle is equilateral.
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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.
-- An isosceles triangle has two equal sides. -- An isosceles triangle has two equal angles. -- An isosceles triangle has two equal interior-angle bisectors. -- The bisector of the vertex angle of an isosceles triangle is also the perpendicular bisector of the triangle's base.