Consider the following sets. u = {all triangles} e = {x|x ∈ u and x is equilateral} i = {x|x ∈ u and x is isosceles} s = {x|x ∈ u and x is scalene} a = {x|x ∈ u and x is acute} o = {x|x ∈ u and x is obtuse} r = {x|x ∈ u and x is right} which is a subset of i? a) e b) s c) a d) r

Option a) E is a subset of I.

Step-by-step explanation:

In this question U is the set of all types of triangles.

E is the subset of U containing equilateral triangles

I is the subset of U containing triangles isosceles

S is the subset of U containing triangles scalene

A is the subset of U containing acute angle triangles.

O is the subset of U containing obtuse angle triangles.

R is the subset of U containing right angle triangles.

Now we have to tell which is a subset of I.

Since I is the set of isosceles ( having two angles equal) triangles and E is the set of equilateral (all sides equal) triangles.

Therefore E should be the subset of I.

Option a) E is the answer.

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step-by-step explanation: