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Calculate perimeter
1 Workouttheperimeterofeachshape.
a)
perimeter= cm
b)
perimeter= mm
c)
perimeter= m
2 RosieandEvaworkouttheperimeteroftheshapebelow.
Whoiscorrect?
Howdoyouknow?
3 Ticktheshapeswithaperimeterof16cm.
©WhiteRoseMaths2019
5cm
5cm
3cm3cm
8cm
2cm 40mm
40mm
20mm
6cm
4cm
3m
6 + 4 = 10, so the perimeter is
10 cm.
Rosie The perimeter is 20 cm. Eva
10cm
6cm
6cm
2cm
b)
perimeter=
Whatdoyounotice?
6 Thisrectanglehasaperimeterof18cm.
Workoutthelengthofsidea.
perimeter=18cm
sidea=
4 Whichshapehasthelongestperimeter?Tickyouranswer.
Showallyourworkings.
5 Workouttheperimeteroftheseshapes.
a)
perimeter=
©WhiteRoseMaths2019
4cm
4cm
3cm3cm
20mm 20mm
20mm 20mm
20mm
6cm 6cm
2cm
8cm
3cm
5cm
7cm
2cm
9cm
70mm
80mm
20mm10mm
30mm
50mm
30mm
50mm
2cm
6cm
a
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