Cambridge International Mathematics

ANSWERS 1

EXERCISE A

1a b c

de

2aacute breflex cstraight dobtuse

ereflex f straight gacute hobtuse

3aacute bobtuse crevolution dreflex

eacute f right angle gobtuse hstraight

i reflex j acute kreflex l obtuse

4a 59 o b 48 o c 85 o d 74 o e 121 o f 133 o

5 KbLM

EXERCISE B

1a...... are collinear. b...... is a line segment.

c...... is line DF. d...... are concurrent at D.

2a b

cd

EXERCISE C

1aright angled, scalene bobtuse angled, isosceles

cobtuse angled, scalene dequilateral

eacute angled, isosceles fright angled, isosceles

2a b c

de f

gh i

3a² Opposite sides are equal in length.

² Opposite angles are equal in size.

² Diagonals bisect each other.

b ² Opposite sides are parallel.

² Opposite angles are equal in size.

² Diagonals bisect each other at right angles.

² Diagonals bisect the angles at each vertex.

EXERCISE D

1a 2 b 4 c 2 d 4 e 2 f 0 as is not a rhombus

g 10 h infinite i 3 j 5 k 1 l 3

2 A, B, C, D, E, H, I, K, M, O, T, U, V, W, X, Y

3a b c

4a b

cd

5a 4 b 2 c 3 d 2 e 8 f 4

65 7 H, I, N, O, S, X, Z

EXERCISE E

1a b

ccannot form a triangle

A B

C

D X

Y

Z

transversal

3cm

2cm 3cm

4cm

2cm 3cm

2cm 3cm

5cm

IB MYP_3 ANS

cyan magenta yellow black

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Y:\HAESE\IGCSE01\IG01_AN\AssKnowGm-Pu\001IB_IGC1_agm_an.CDR Friday, 21 November 2008 10:07:35 AM PETER