Question

Consider the sets below.

A x
B x

Which is true?

A ⊂ B
B ⊂ A
Ac = B
Bc = A

Answer 1

B ⊂ A

Explanation:

Answer 2

B ⊂ A

Explanation:

We know that:

A x is a polygon

So set A is the set of all polygons.

B x is a triangle

Set B is the set of all triangles.

First, a polygon is a plane geometrical figure made of a finite sequence of straight segments.

For example, a triangle is a polygon, a rectangle is a polygon, etc.

Then, all triangles are polygons, but not all polygons are triangles.

So we can conclude that the whole set B is included in the set A.

Then the correct notation would be:

B ⊂ A