Either one or two
there are three angles on an isosceles triangle
If its in the form of an isosceles right angle triangle then it will have 2 equal sides.
No. An isosceles right triangle is a special case. There are many right triangles which are not isosceles.
One.One.One.One.
An isosceles triangle can have 1 right angle providing that the other 2 angles each measure 45 degrees.