Question

What universal set(s) would you propose for each of the following
1. The set of right triangles
2. The set of isosceles triangles

Answer 1

it is the set of a triangle

Answer 2

I)For the set of right triangle universal set can be the set of triangle or set of polygons or set of 2-D figures

ii) for the set of isosceles triangle universal set can be the set of triangle or set of polygons or set of 2-D figures