A triangle is usually referred to with a name consisting of the labels of its three vertices. If that's the system implied in this question, then the three vertices of the subject isosceles triangle are the points 'j', 'k', and 'l', and 'kl' is the line between the points 'k' and 'l', i.e. one side of the triangle. We don't know any more than this, like whether or not the side 'kl' is one of the two equal sides.
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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.