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Universal Set

Let U be the ...

Question

Let U be the set of all triangles in a plane. If A is the set of all triangles with at least one angle different from 60°, what is?

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Solution

is the set of all equilateral triangles.

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U

be the set of all triangles in a plane. If

A

is the set of all triangles with at least one angle different from

60^{\circ}

A^{'}

U

be the set of all triangles in a plane. If

A

is the set of all triangles with at least one angle different from

60^{\circ},

A^{'} ?

A = set of all triangles
B = set of all right triangles
A - B=?

U = set of all triangles
A = set of all equilateral triangles
So,
A^c = ?

ξ

= the set of all triangles,

P =

the set of all isosceles triangles,

Q =

the set of all equilateral triangles,

R =

the set of all right angles triangles. What do the sets

P \cap Q

R - P

represent respectively?

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