The length of a rectangle

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Question from Tris, a student:

Hi,
I'm trying to figure out the length of a rectangle but i forgot how. So, the width is
5cm and the perimeter is 34cm.

Hi Tris,

Draw a diagram! In my diagram I let $L$ be the length of the rectangle.

rectangle length

Write an expression for the perimeter of the rectangle in terms of $L.$ The value of this expression is 34 cm. Solve for $L.$

Penny

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