Examine whether the following are polygons. If any one among them is not, say why? (d)

Examine whether the following are polygons. If any one among them is not, say why? (a)

Examine whether the following are polygons. If any one among them is not, say why? (b)

Examine whether the following are polygons. If any one among them is not, say why? (c)

Examine whether the following statements are true or false: { a }∈ { a, b, c }

Examine whether the following statements are true or false: { a }⊂ { a, b, c }

Examine whether the following statements are true or false: { a, b } ⊄ { b, c, a }

Examine, whether the following numbers are rational or irrational : (sqrt2+2)^(5)

Examine whether the following statements are true or false: { a, e } ⊂ { x : x is a vowel in the English alphabet}

Examine, whether the following numbers are rational or irrational : (10)/(10sqrt5)

Examine, whether the following numbers are rational or irrational : (3+sqrt3)(3-sqrt3)