Question

What universal set (s) would you propose for each of the following:
(i) The set of right triangles
(ii) The set of isosceles triangles
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Answer 1

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(i) Among the set of right triangles, the universal set is the set of triangles or the set of polygons.

(ii) Among the set of isosceles triangles, the universal set is the set of triangles or the set of polygons or the set of two-dimensional figures.