Q: Is centre required for proving the congruency of two circles?

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Multitude

A square does have a centre.

No not all circles have the same centre. If the circles formula is in the form x2+ y2=r2 then the centre is always the origin= (0,0). But if the formula for the circle is in the form (x-h)2+(y-k)2= r2 then the centre is the the opposite sign of the h and the k. Eg. (x+4)2+(y-9)2=16 the centre would be (-4,9) and the radius would be 4

Concentric circles - are circles that share a common centre. A typical example - is dripping water into a bowl - where you'll see the ripples form and spread out to the edge of the container.

When they have the same centre. As a consequence, the distance between the two circles, along any common radial ray, is a constant.

Related questions

Concentric circles are circles with the same common centre.

They are circles that have a common centre

Concentric circles

let the two circles with centre O and P are congruent circles, therefore their radius will be equal. given: AB and CD are the chords of the circles with centres O and P respectively. ∠AOB=∠CPD TPT: AB=CD proof: in the ΔAOB and ΔCPD AO=CP=r and OB=PD=r ∠AOB=∠CPD therefore by SAS congruency, ΔAOB and ΔCPD are congruent triangle. therefore AB=CD

Multitude

If you mean they both have the same centre - they're called 'concentric' circles.

Concentric circles have the same centre point while eccentric circles although being within each other have differing centre points[the inner cirles are off centre].

No. Concentric circles have the same centre but not [usually] the same radius. Congruent circles have the same radius, but not [usually] the same centre. If you have two concentric congruent circles one will be exactly on top of the other.

If they have a common centre, they are concentriccircles.

A square does have a centre.

the C in netball is centre and the centre position starts with the ball before the whistle blows and they can go anywhere on the court,but the two semi-circles (shooting circles).

No not all circles have the same centre. If the circles formula is in the form x2+ y2=r2 then the centre is always the origin= (0,0). But if the formula for the circle is in the form (x-h)2+(y-k)2= r2 then the centre is the the opposite sign of the h and the k. Eg. (x+4)2+(y-9)2=16 the centre would be (-4,9) and the radius would be 4