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N number of circles are formed with a common centre, what is that geometry called?

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N number of circles are formed with a common centre, what is that geometry called?

(a) Inscribed circle

(b) Sphere

(c) Circumscribed circle

(d) Concentric circle

I had been asked this question in semester exam.

I'd like to ask this question from Geometrical Construction topic in division Lettering Practice, Scales & Curves of Civil Engineering Drawing

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Correct choice is (d) Concentric circle

The explanation: Two or more circles with same centre and different radii, are termed as concentric circle. Inscribed circle is the largest possible circle drawn inside a polygon, each side of the polygon must be tangent to the circle, while a circle containing a polygon in its interior touching all vertices of a plane figure is called circumscribed circle.

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