Cambridge International Mathematics

102 Lines, angles and polygons (Chapter 4)

EXERCISE 4C

1 Findx, giving reasons:

abc

de f

2 Findx, giving brief reasons:

abc

3 Classify the following triangles as equilateral, isosceles or scalene. They are not drawn to scale, but

the information marked on them is correct.

abc

def

4 The figure alongside has not been drawn to scale.

a Findx.

b What can be deduced about the triangle?

x°

70°

P

Q R

72°

x°

A

B

C

x°

() 2 x°

A

B

C

x°

()146¡-¡x°

Q

P

R

120°

A B x°

C

D

65°

x°

A B C

D

A

B C

x°

()x°¡+¡24 52°

60°

A

B C 60°

G

HI

75°

30°

J

K L

45°

D

EF

q°

2 q°

classifyDPQS

P

Q R S

W Z

Y

X

classify WXYD

x°

A

B M C

46°

46°

xcm 63° 63°

9cm

10 cm

A

B

C

D

xcm 16 cm

75° 75°

A

B C

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y:\HAESE\IGCSE01\IG01_04\102IGCSE01_04.CDR Wednesday, 8 October 2008 10:04:21 AM PETER