Find the Universal Set for Right Triangles and Isosceles Triangles
What universal set(s) would you propose for each of the following:
(i) The set of right triangles.
(ii) The set of isosceles triangles.
Solution
(i) A suitable universal set for the set of right triangles is \[ \text{the set of all triangles} \]
(ii) A suitable universal set for the set of isosceles triangles is \[ \text{the set of all triangles} \]