Tuesday 29 November 2011

Class-ix mathematics formative Assignment


SECTION A (4 x 1M= 4M)
1. In the given figure fig. 9.1, ABCD is a parallelogram and AEB is a triangle. If Ar (ABCD) = 172.6cm2,
 then Ar ( ABE) =_________  (a) 86.3cm2 (b) 172.6cm2 (c) 345.2cm2 (d) cannot be determined.







2. In the given figure fig. 9.2, chord AB at a distance of 9cm from the center O of the given circle. If radius of the circle is 41cm, length of chord AB is:         
(a) 40cm (b) 80cm (c) 50cm (d) cannot be determined
3. In fig. 9.3 ABCD is a parallelogram, AP ^ DC and CQ ^ AD. If AB = 10cm, AD = 8cm and AP = 8cm then 
CQ = ----                                           
(a) 16cm (b) 10cm (c) 8 cm (d) none of these.
4. In fig. 9.4, If O is the center of the circle and AB = CD, then OL : OM = __ (a) 2:1 (b) 1:2 (c) 1:1 (d) none of these.
                                                                 
 SECTION B (3 x 2M = 6M)

5. in fig. 9.5, A and B are points on sides PQ and QR of parallelogram PQRS. Show that Ar (ARS) = Ar(PBS)                                                                                                                              
6. In fig. 9.6, AB and BC are two chords of a circle with centre O such that <ABO = <CBO.  Show that AB = BC
7. Construct the angle of measurement 22½ ° 



                                                                                


SECTION C (2 x 3M = 6M)      
                                                  
8. A line l parallel to side BC of ABC meets AB at X and AC at Y. Also lines parallel to AB through C and AC through B meets line l at E and F respectively. 
Then prove that Ar (ABF) = Ar (ACE).
9. In fig. 9.7, O is the centre of the circle. Determine ÐDAC, ÐACB, ÐADE.      
   
 SECTION D (1 x 4M = 4M)
10. Prove that the angle subtended by an arc at the centre is double the angle subtended by it at any point on the remaining part of the circle.                                                                                                      
                                           (OR),
In fig. 9.8, P is a point in the interior of a parallelogram ABCD. Show that 
1) Ar (APB) + Ar (PCD) = ½ Ar(ABCD)       
2) Ar(APD) + Ar(PBC) = Ar(APB) + Ar(PCD)

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