# What universal se

(i) We know that right triangles are a type of triangle with an angle 90°

Thus, a set of triangles will contain all the right triangles.

universal set, U = {x: x is a triangle in plane}

(ii) We know that isosceles triangles are a type of triangle with any two of the angles equal in measure.

Thus, a set of triangles will contain all the isosceles triangles.

universal set, U = {x: x is a triangle in plane}

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