Example 17 Self Tutor
In the diagram,¡!
AB=p and¡!
BC=q,
M is the midpoint of AB and N divides
BC in the ratio1:2. Find in terms ofp
andq, vector expressions for:a¡¡!
AM b¡!
BN c¡!
AN
d¡¡!
MC e¡¡!
MN
a¡¡!
AM=^12
¡!
AB
=^12 pb¡!
BN=^13
¡!
BC
=^13 qc¡!
AN=
¡!
AB+
¡!
BN
=p+^13 qd¡¡!
MC=
¡¡!
MB+
¡!
BC
=^12 p+qe¡¡!
MN=
¡¡!
MB+
¡!
BN
=^12 p+^13 qEXERCISE 24H
1 Find, in terms ofr,sandt:
a¡!
OB b¡!
CA c¡!
OC
2 Find, in terms ofp,qandr:a¡!
AD b¡!
BC c¡!
AC
3 In the diagram,¡!
OA=p,¡!
AB=q, and M is the midpoint
of AB.a¡¡!
AM b¡!
OB c¡¡!
BM d¡¡!
OM.
4 In the diagram¡!
OA=r,¡!
AB=s,¡!
OC=t, and M is the
midpoint of BC.
Find, in terms ofr,sandt, vector expressions for:
a¡!
BC b¡¡!
BM c¡¡!
AM d¡¡!
OM.
rstA BCOpqrABCDp q MAB
OrtsMA BCOpq
NBC
AMFind, in terms ofpqand , vector expressions for:500 Vectors (Chapter 24)IGCSE01
cyan magenta yellow black(^05255075950525507595)
100 100
(^05255075950525507595)
100 100
Y:\HAESE\IGCSE01\IG01_24\500IGCSE01_24.CDR Monday, 27 October 2008 2:27:18 PM PETER