Q1 of 31 Page 52

Let us see the adjoining figure of the circle with centre O and write the radii which are situated in the segment PAQ.


Radius is the line segment that joins center and circumference of a circle.


So, OA, OC, OP, OQ and OB are the radii.


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2

Let us write in the following by understanding it.

i. In a circle, there are number of points.


ii. The greatest chord of the circle is.


iii. The chord divides the circular region into two.


iv. All diameters of the circle pass through.


v. If two segments are equal, then their two arcs are in length.


vi. The sector of the circular region is the region enclosed by the arc and the two.


vii. The length of the line segment joining the point outside the circle and the center is than the length of radius.

3

With the help of scale and pencil compass let us draw a circle and indicate centre, chord, diameter, radius, major arc, minor arc on it

 4

Let us write true or false:

i. The circle is a plane figure.


ii. The segment is a plane region.


iii. The Sector is a plane region.


iv. The chord is a line segment


v. The arc is a line segment.


vi. There are finite number of chords of same length in a circle


vii. One and only one circle can be drawn by taking a fixed point as its centre.


viii. The lengths of the radii of two congruent circles are equal.

 1

The length of a radius of a circle with its centre O is 5 cm. and the length of its chord AB is 8 cm. Let us write by calculating, the distance of the chord AB from the centre O.