Circle is the locus of co-planer points which are unidistance from a point in same plane.

Types of circles

Congruent Circles

Concentric Circles

Circles with same centre are concentric circles.

Intersecting and touchig circles

Circles passing through two points

Infinitely many circles can be draw passing through two points.

Tangent and secant

Converse of Tangent Theorem

Tangent Secant Theorem.

Theorem of touching circles

Activity - Enter the measure of arc and observe the type.

Theorem of congruent chord.

Theorem of congruent arcs.

Angles insribed in same arc

Cyclic quadrilateral

Theorem of cyclic quadrilateral

Internal Division of chords

External Division of Chords