1 Whichpairsofanglesareequal?Tickyouranswers.

Discussyouranswerswithapartner.

2 a) Workoutthesizesoftheunknownanglesandlabelthemon

thediagram.

b) Anglescandeareco-interior.

Whatisthesumofanglescande?

� �

c) Anglesbandharealsoco-interior.

Whatisthesumofanglesbandh?

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d) Whatdoyounotice?

e) Completethesentence.

Co-interiorangles

3 Completethesentences.

a) Anglescand areco-interior.

Angleseand areco-interior.

Angleshand areco-interior.

Anglesband areco-interior.

b) Angleseandaare

Angleseanddare

Angleseandcare

Angleseandgare

Identifyand calculate with co-interior, alternateand correspondingangles

©WhiteRoseMaths2020

b

g

d

h e

c

f

63°a

d

h

c

g

a

e

b

f

a

e

d

h

b

f

c

g

6 x: y=2:1

Workoutthesizeofanglez.

z=

Discussyourreasoningwithapartner.

7

a) ShowthatlinesegmentsABandCDarenotparallelwhenx=12

Explainyouranswer.

b) LinesegmentsABandCDareparallel.Workoutthesizesoftheangles

andlabelthemonthediagram.

Discussyourmethodwithapartner.

4 Mohasmeasuredtwoangles.

a) ArelinesegmentsABand

CDparallel?

Explainyouranswer.

b) Evasays,“Ithinktheycouldbeparallel.”

WhymightEvathinkthis?

5 Workoutthesizesoftheunknownangles.

Givereasonsforyouranswers.

a) a= because

b) b= because

c) c= because

d) d= because

©WhiteRoseMaths2020

57°

A B

C D

121°

x

y

z

a

91°

b111°

d73° 72°

c

63.2°

A

B

(7x+20)°

(3x+10)°

D

C