•A circle is the collection of all points inthe plane, which are equidistant from afixed point in the plane.• A circle is a plane figure.• Euclid discovered the circle.•The fixed point is called the centre ofthe circle• The fixed distance is called the radiusof the circle.• The longest chord of the circle is thediameter of the circle.
If the length of two chordsare equal then theirdistance from centre isalso equal.
O is the centre.AB and CD are two equal chords.Angle AOB = Angle COD
In AOB and COD AO = CO (Radius of circle) AB = CD (Given) OB = OD (Radius of circle) By SSS Congruence rule, AOB is congruent to CODBy c o r r e s p o n d i n g p a r t o fc o n g r u e n t t r i a n g l e A n g l e A OB = A n g l e COD
Harsha Detani 9031Dimple Tak 9024Nikita Soni 906Harshita Tomar 2 903 5Heena Detani 903Kriti Singhal 6 904
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