Exercise 4.6
Q1. From the figure, identify :
(a) the centre of circle
Solution: The centre of circle is O.
(b) three radii
Solution: Three radii are OA, OB and OC.
(c) a diameter
Solution: AC is diameter of circle.
(d) a chord
Solution: ED is a chord.
(e) two points in the interior
Solution: Two points in the interior are P and O.
(f) a point in the exterior
Solution: Q is the point in the exterior of circle.
(g) a sector
Solution: AOB forms sector.
(h) a segment
Solution: ED forms segment.
Q2. (a) Is every diameter of a circle also a chord?
(b) Is every chord of a circle also a diameter?
Solution:
(a) Yes, every diameter of a circle is also a chord.
(b) No, every chord of a circle is not a diameter.
Q3. Draw any circle and mark
(a) its centre
(b) a radius
(c) a diameter
(d) a sector
(e) a segment
(f) a point in its interior
(g) a point in its exterior
(h) an arc
Solution:
(a) its centre : O
(b) a radius : OA
(c) a diameter : AC
(d) a sector : AOB
(e) a segment : ED
(f) a point in its interior : Point P
(g) a point in its exterior : Point Q
(h) an arc : arch AB
Q4. Say true or false :
(a) Two diameters of a circle will necessarily intersect.
(b) The centre of a circle is always in its interior.
Solution:
(a) True
(b) True