Cambridge International Mathematics

Lines, angles and polygons (Chapter 4) 97

stu

3 Find, giving brief reasons, the value of the unknown in:

abc

de f

gh i

4 State whether KL is parallel to MN, giving a brief reason for your answer. Note that these diagrams

are sketches only and have not been drawn accurately.

abc

5 Find the value of the unknowns in:

abc

s°

81° r°

c°

b° a°122°

d¡°

68°

155°

b°

e°

145° e°e°

d°

3°f

3°f

3°x

45°

()3 ¡-¡23x °

()x¡+¡44°

()2 ¡+¡10x ° ()x¡+¡35° 2¡x°

()3 ¡+¡15x °

3°h^2 h° 2°g g° x°

()2 ¡-¡75x °

85°

85°

K

L

M

N

91°

91°

K L

M N

96° 96°

K

L

M

N

120°

x°

y°

r°

q°

p°

65°

a° b°

35°

IGCSE01

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Y:\HAESE\IGCSE01\IG01_04\097IGCSE01_04.CDR Friday, 12 September 2008 2:27:14 PM PETER