QuestionDraw a Venn diagram for sets of triangles: equilateral $E$, isosceles $I$, right-angled $R$. Describe their unions and intersections.

Studdy Solution
The set $\cap R$ represents all triangles that are both equilateral and right-angled. However, it is impossible for a triangle to be both equilateral and right-angled, so this set is empty.