1 Completethesentences.

Usethewordbanktohelpyou.

90

180

greater

less

a) Arightangleis degrees.

b) Anacuteangleis than degrees.

c) Anobtuseangleis than degrees

butlessthan degrees.

2 Matchtheanglestothelabels.

rightangle acuteangle obtuseangle

3 Labeltheangles:acute,obtuseorrightangle.

a) b) c)

d) e) f)

4 Whichareacuteangles?

5 Whichareobtuseangles?

6 Labeltheangles:acute,obtuseorrightangle.

a) c)

b) d)

Identify angles

©WhiteRoseMaths2020

7 Istheangleacute,obtuseorarightangle?

a) 35°

b) 99°

c) 90°

d) 89°

e) 121°

f) 179°

Howdoyouknow?

8

Angle B is obtuse because it’s bigger than

the right angle.

A B

DoyouagreewithTeddy?

Explainyouranswer.

9 Arethestatementsalwaystrue,sometimestrueornevertrue?

Explainyouranswer.

a) An obtuse angle is a greater turn than an acute angle.

b) An acute angle is a greater turn than a right angle turn.

c) If you turn through two acute angles you will have turned through an obtuse angle.

Identify angles

©WhiteRoseMaths2020

d) e) f)

4 Whichareacuteangles?

5 Whichareobtuseangles?

6 Labeltheangles:acute,obtuseorrightangle.

a) c)

b) d)