1 Whichpairsofanglesareequal?Tickyouranswers.
Discussyouranswerswithapartner.
2 a) Workoutthesizesoftheunknownanglesandlabelthemon
thediagram.
b) Anglescandeareco-interior.
Whatisthesumofanglescande?
� �
c) Anglesbandharealsoco-interior.
Whatisthesumofanglesbandh?
� �
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
