Cambridge International Mathematics

2 Assumed Knowledge (Geometry and graphs)

There are several ways to label angles.

We can use a small case letter or a letter of the Greek alphabet.

We can also usethree point notationto refer to an angle.

For example, the illustrated angleμis angle PQR or PQR.b

1 Draw a freehand sketch of:

a an acute angle b an obtuse angle c a right angle

d a reflex angle e a straight angle

2 State whether the following angles are straight, acute, obtuse or reflex:

abcd

efgh

3 For the angle sizes given below, state whether the angle is:

i a revolution ii a straight angle iii a right angle

iv an acute angle v an obtuse angle vi a reflex angle.

a 31 o b 117 o c 360 o d 213 o e 89 o f 90 o

g 127 o h 180 o i 358 o j 45 o k 270 o l 150 o

4 Find the measure of angle:

a BAC b DAE

c BAD d CAE

e CAF f BAE

5 Which is the larger angle,

KbLM or PbQR?

P

Q

R

q

L

M

K

Q

R

P

F A B

E

D

C

47°

48°

26°

59°

EXERCISE A

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