Question

Q11. The length of a rectangle is twice its breadth .Find its perimeter if its length is 12cm.​

Answer 1

Answer:

$w = width \\ l = length = 2w \\ l = 12cm \\ 2w = 12cm \\ w = 6cm \\ p = 2(l + w) \\ p = 2(12cm + 6cm) \\ p = (18cm) \\ \\ p = 36cm \\ the \: perimeter \: is \: 36cm \: . \\ \\ \\ \\ \\ hope \: it \: helps \: u \: dear$

Answer 2

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Given :—

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• The length of a rectangle is twice its breath.
• If its length is 12 cm.

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TO Find :—

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• The perimeter.

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Solution :—

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it's given that the length is twice the breadth.

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let the breadth be x.

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the length is twice the breadth.

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» x × 2 = 12

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» 2x = 12

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» x = 12/2

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» x = 6.

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★ Finding the perimeter :—

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Formula used :–

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$\begin{gathered} { \underline{ \red{ \boxed{ \tt{ Perimeter_{(rectangle)} = 2(l + b)}}}}} \end{gathered}$

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Where~

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• l donates length.
• b donates breadth.

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Putting all the values :

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$\qquad\rightarrow \tt{Perimeter = 2(12 + 6)}$

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$\qquad \rightarrow \tt{Perimeter = 2(18)}$

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$\qquad \rightarrow \tt{36cm}$

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$\begin{gathered}{ \blue{ \underline{ \boxed{ \bf{.°. The \: perimeter \: of \: the \: rectagle \: is \: 36cm}}}}} \end{gathered}$

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