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Measure with a protractor
1 Herearesomeangles.
a) Sorttheanglesintothetable.
Acuteangle Obtuseangle Rightangle Reflexangle
b) Howdidyoudecidewheretoplaceeachangle?
c) Estimatethesizeofeachangle.
A C E
B D F
Compareanswerswithapartner.
2 Whatisthesizeofeachangle?Circleyouranswer.
a)
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40° 140°
b)
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61° 119°
c)
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0 180
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17010
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37° 143°
d)
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0 180
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9080
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10
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0 180
1800
17010
16020150
30140
40
130
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9080
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12050
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0 180
1800
17010
16020150
30140
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130
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9080
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0 180
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17010
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21° 159°
Lookattheanglesyouhavenotcircled.
Whymightsomebodythinktheyarecorrect?
©WhiteRoseMaths2020
A
B
C
D
E
F
3 Measurethesizeofeachangleusingaprotractor.
a) e)
b) f)
c) g)
d) h)
©WhiteRoseMaths2020
4 a) Workoutthesizesoftheangles.
a=
b=
c =
b) Discusswithapartnerhowyouworkedouteachangle.
c) Findthetotalofyourthreeangles.
Whatdoyounotice?
5 Rosieismeasuringthesize
ofthisangle.
a)
DoyouagreewithRosie?
Explainyouranswer.
b) Measurethesizeoftheangle.
I can’t measure it because my protractor doesn’t go that far.
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a
b
c
