Page 91 - Start Up Mathematics_6

3. From the figure, identify: D C

(a) the centre of circle (b) three radii
E
(c) a diameter (d) a chord O P Q
(e) two points in the interior (f) a point in the exterior

(g) a sector (h) a segment A
B
4. (a) Is every diameter of a circle also a chord?
(b) Is every chord of a circle also a diameter?

5. Say true or false:
(a) Two diameters of a circle will necessarily intersect.
(b) The centre of a circle is always in its interior.

Exemplar Problems

1. Number of lines passing through five points such that no three of them are collinear is:
(a) 10 (b) 5 (c) 20 (d) 8
2. The number of common points in the two angles marked in the given figure is ___________.

B

E P D

A
R C

F
3. The common part between the two angles BAC and DAB in the given figure is ___________.

B
D

A C

4. What is common in the following figures (i) and (ii).

(i) (ii)

Is figure (i) that of triangle? If not, why?
5. In the given figure name any: A D

(a) four angles that appear to be acute angles. E
(b) two angles that appear to be obtuse angles. B C

83