EXERCISE 4.1.

1) Using the figure to name:

a) Five points
Ans: O, B, C, D, E
b) a line
Ans: DB , many such lines are there like DE , ED , DB, etc
c) Four rays
Ans: OC , OB , OE , OD 
d) Five line segments
Ans: DE , DO , DB , EO , EB 

2) Name the line given in all possible (twelve) ways choosing only two letters at a line from the four given

Ans: AB , AC , AD , BA,  BC , BD , CA,  CB ,CD ,DA DB and DC.

3) Name the following:
a) A line containing point E
Ans: AE
b) line passing through A
Ans: AD
c) Line on which o lies
Ans: CO
d) Two pairs of intersecting lines
Ans: CO  and AE                                                                                                                        AE  and FE 

4) How many lines can pass through
a) One given point?
Ans: Infinite or countless
b) Two given points
Ans: Only one

5) Draw a rough figure and give a  suitable label for each of the following ones:
a) Point P lies on AB 
Ans:
b) Ray XY  and ray PQ  intersect at M
Ans:

c) Line l contains E and F but not  O
Ans:

d) Ray OP  and OQ  meet a O
Ans:

6) Consider the following figure of line MN Say whether following statements are true or false in context of the given figure

a) Q, M, O, N, P are points in the line MN 
Ans: True
b) M, O, N are end points of line segment MN 
Ans: True
c) M and N are end points of line segment MN 
Ans: True
d) O and N are end points of line segment OP 
Ans: False
e) M is one of the end points of line segment QO 
Ans: False
f) M is point on ray OP 
Ans: False
g) Ray (OP)  is different from ray QP 
Ans: True
h) Ray (OP)  is same as ray OM 
Ans: False
i) Ray (OM)  is not opposite to ray OP 
Ans: False
j) O is not an initial point of ray OP 
Ans: False
k) N is the initial point of ray NM  and ray NM 
Ans: True