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Plz help me with this

Plz help me with this-example-1
User Jorilallo
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2 Answers

7 votes
12*2+400*2=824
the answer is 824
User Ching Chong
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4 votes
824 just add all the sides so 12+12+400+400=824 and in simpler form w2+l2
User Yule
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