In Exercises 11 to 14, determine whether the sets have a subset relationship. Are the two sets disjoint or equivalent? Do the sets intersect? 11. L{equilateral triangles}; E = {equiangular triangles} = 12. S={triangles with two sides}; A = {triangles with two = s} 13. R{right triangles}; 0 = {obtuse triangles}