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2015-05-21T19:57:15+08:00

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Perimeter=2(length+width) \\ =2(47cm+21cm)=2(68cm)=136cm
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2015-05-21T23:16:05+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Formula for the perimeter of a rectangle:
P=2(l+w)

substitute with the given measurements
P=2(47 cm+21 cm)
P=2(68 cm)
P=136 cm

Hope this helps =)
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