The start point should be the end point.(X1,Y1)=(X2,Y2).

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Verify if the shape is indeed a circleby checking the radius (shd be half of the diameter)by checking the diameter(diameter shd be twice that of the radius).

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Indeed 1) Starting point should be the end point, but2) Verifying at the regular intervals that radius is same. If suppose radius (r) = 5 at 0 deg of angle then r = 5 at 45, 90, 135,180, 270 and 360 deg of angle.

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(x1,y1)=(x2,y2)? Very simplistic and not conclusive. This could imply any closed figure, not necessarily a circle.

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X1,y1)=(x2,y2)? Very simplistic and not conclusive. This could imply any closed figure, not necessarily a circle.

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1.Check it cannot be straight2.Check it can be curve only3.Check the starting point be the end point too4.Check whether it is measured from the centre to any part it can be equal

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TESTING A CIRCLEUsing simple words that do not imply knowledge of mathematical jargon, I would write these three test cases:Precondition:There is a figure drawn on a piece of paper.TC1) It is a closed figure.TC2) It has a center point.TC3) The distance from center point to closest point on figure is equal in all directions.

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1 ) Check whether you have a compass or not. 2 ) Check whether the compass is tight or not.3 ) Check whether you have inserted a pencil to it. 4 ) Check whether the inserted pencil has a sharp tip5 ) Chk whether you can draw a recoginzed shape of the circle. 6 ) Check whether it as a midpoint. 7 ) Check whether you are able to measure the radius of the circle from the kid point. 8 ) Check whether you are able to get the diameter of the circle . where dia= twice the radius.

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1. It should pass through 3 distinct points lying in the same plane.2. All lines joining 2 opposite points on this object should pass through a single point and have same dimension(length).

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