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Q: What is the measure of each arc of a circle that is circumscribed about an equilateral triangle?

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No.

Centre

Yes. One can satisfy oneself that this is true just by considering the symmetry of the construction.

Yes.

The circumcenter of a triangle is the center of a circle circumscribed around a triangle with each of the vertices of the triangle touching the circumference of the circle.

Related questions

To circumscribed a circle about a triangle you use the angle. This is to get the right measurements.

A triangle has exactly one circumscribed circle.

No.

the sum of the angles of a plane triangle is always 180° In an equilateral triangle, each of the angles is = Therefore, the angles of an equilateral triangle are 60°

Centre

Yes. One can satisfy oneself that this is true just by considering the symmetry of the construction.

Yes.

no

circumscribed about

true

True

Yes, it is.