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CIRCLES

CIRCLESA circle is the set of all points in a plane that are the same distance from a given point, called the center of a circle.

CENTRE OF A CIRCLE

RADII IS THE PLURAL OF RADIUS.

RADII IS THE DISTANCE FROM THE CENTRE TO THE CIRCUMFERENCE.

RADII OF A CIRCLE

DIAMETER OF A CIRCLE

DIAMETER IS THE LONGEST CHORD.

DIAMETER IS A STRAIGHT LINE JOINING TWO POINTS ON A CIRCLE AND PASSING THROUGH THE CENTRE.

CHORD OF A CIRCLE

A CHORD IS A STRAIGHT LINE JOINING TWO POINTS ON A CIRCUMFERENCE OF A CIRCLE.

ARC OF A CIRCLE

An arc is the part of the circumference.

SECTOR OF A CIRCLE

A sector is the part of a circle between two radii and an arc.

SEGMENT OF A CIRCLE

A segment is the part of a circle between a chord and an arc.

SECANT OF A CIRCLE

A secant is a straight line which touches a circle at two points.

TANGENT OF A CIRCLE

A tangent is a straight line which touches a circle at only one point.

Tangent is perpendicular to the radius through the point of contact.