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No.
Centre
Yes.
Yes. One can satisfy oneself that this is true just by considering the symmetry of the construction.
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.
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.
Centre
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°
Yes.
Yes. One can satisfy oneself that this is true just by considering the symmetry of the construction.
no
circumscribed about
true
True
Yes, it is.