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   Circles - Class X
Formulae, Relations, Theorems etc.
Circles
Definition
Collection of points at a constant disctant from a fixed point in a plane.

Radius
A line segment from centre of circle to any point on the circle.

Chord
A line segment joining two points on the circle.

Arc
Part of circle.

Secnat
A line intersecting the circle at two points.

Tangent
A line intersecting the circle at a point.

Point of contact
Point of intersection of circle and tangent

Tangents from same external point to the circle are equal.

Tangent is perpendicular to radius at point of contact.

Tangents are equally inclined to line joining centre of circle to external point.

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