6CentreCentre: Each point of a circle is at equal distance from a fixed point.The fixed point is called the centre of the circle.Centre is in the interior part of the circle but centre is not a part of a circle.
7RadiusThe distance from the centre to any point on the circle is called the radius of the circle.
8DiameterA line segment passing through the centre and whose end points are on the circle is called the diameter of the circle.
9Chord A line segment whose end points are on circle is called a chord. Diameter is a longest chord of the circle.
10CircumferenceThe length of a circle is called a circumference.
11Assessment Fill in the blanks 1. -------- is not a part of a circle. 2. Centre lies in the part of a circle.3. Diameter of a circle is of theradius.of the circle is half of itsdiameter.