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11-10-2018
Mathematics

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A rectangle has perimeter 78 cm and length 34 cm. What is its? width?

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Аноним Аноним

11-10-2018

The perimeter of a rectangle is twice the sum of the dimensions:

[tex] 2p = 2(w+l) [/tex]

We know two of the three unkowns, so we can solve for w:

[tex] 78 = 2(w+34) \iff 78 = 2w+68 \iff 10=2w \iff w=5 [/tex]

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