Yes. Other congruent triangles can be constructed on the same circumcircle. They have the same shape and size as the given triangle but are positioned differently on the circle.
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The circumcentre is always equally distant from all three vertices of a triangle. Therefore, OA, OB and OC are equal. Small differences may appear only because of minor drawing or measuring errors.
The triangle formed is an acute-angled triangle. In every acute-angled triangle, the circumcentre lies inside the triangle. Therefore, the centre of the circumcircle is located inside the triangle.