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The formula P=2w + 2l is used to find the perimeter of arectangle, where w is the width and l is the length.Write a formula that can be used to find the length of arectangle. Show all your work.

Sagot :

The formula for the perimeter of a rectangle is given as;

[tex]P=2w+2l[/tex]

To find the formula for the length of the rectangle in terms of the perimeter and the width, let make l the subject of formula.

Firstly subtract 2w from both sides of the formula;

[tex]\begin{gathered} P-2w=2w-2w+2l \\ P-2w=2l \\ 2l=P-2w \end{gathered}[/tex]

Then divide both sides of the equation by 2;

[tex]\begin{gathered} \frac{2l}{2}=\frac{P-2w}{2} \\ l=\frac{P-2w}{2} \end{gathered}[/tex]

Therefore, the formula that can be used to find the length of a

rectangle in terms of the perimeter and width is;

[tex]l=\frac{P-2w}{2}[/tex]